公开(公告)号：US4601738A

公开(公告)日：1986-07-22

申请号：US758351

申请日：1985-07-24

申请人： Yuv R. Mehra

发明人： Yuv R. Mehra

IPC分类号： C07C7/11 ,  C10G5/04 ,  C10L3/10 ,  F25J3/02

CPC分类号： C10L3/10 ,  C07C7/11 ,  C10G5/04 ,  C10G2300/1025

摘要： The Mehra process, for selectively extracting C.sub.2 + hydrocarbons from a raw natural gas stream to produce a residue gas stream meeting pipeline specifications and a natural gas liquid product, is improved by providing a process for purifying the liquid product. This improved process comprises injecting a stream of methanol into the stream of flashed gases from at least the final flashing stage. The injection preferably occurs prior to condensing the flashed gases and must occur prior to reaching the temperature of hydrate formation. The natural gas liquid product from the demethanizing (stripping) column is then allowed to separate into two phases in a surge vessel. The lower layer of methanol/water/physical solvent is removed, the methanol is recovered for recycling to the flashed gases. The upper layer is decanted as purified natural gas liquid product which meets specifications for gumming compounds if the raw natural gas stream is entirely sweet. If, however, the raw stream is sour or has even small quantities of acidic components, such as CO.sub.2, the purified natural gas liquid product is further sweetened with, for example, an aqueous amine treatment.

摘要翻译： 通过提供用于纯化液体产物的方法，改善了用于从原始天然气流中选择性提取C2 +烃以产生满足管道规格的残余气流和天然气液体产物的Mehra方法。 这种改进的方法包括从至少最后的闪光阶段将甲醇流注入闪蒸气体流中。 注射优选在冷凝闪蒸气体之前发生，并且必须在达到水合物形成的温度之前进行。 然后将来自脱甲烷（汽提）塔的天然气液体产物在喘振容器中分离成两相。 除去甲醇/水/物理溶剂的下层，回收甲醇以再循环至闪蒸气体。 将上层作为纯天然气液体产品倾析，如果原始天然气流完全甜，则其符合上胶化合物的规格。 然而，如果原料流酸性或甚至少量的诸如CO 2的酸性组分，则纯化的天然气液体产物通过例如胺水处理进一步增甜。

公开(公告)号：US5462583A

公开(公告)日：1995-10-31

申请号：US206420

申请日：1994-03-04

申请人： Glenn C. Wood ,  Yuv R. Mehra

发明人： Glenn C. Wood ,  Yuv R. Mehra

IPC分类号： B01D53/14 ,  C01B3/52 ,  C07C7/11 ,  C10G5/04 ,  C10L3/10 ,  F25J3/02 ,  B01D47/14

CPC分类号： B01D53/14 ,  B01D53/1493 ,  C01B3/52 ,  C07C7/11 ,  C10G5/04 ,  C10L3/10 ,  F25J3/0209 ,  F25J3/0233 ,  F25J3/0238 ,  F25J3/0257 ,  F25J3/029 ,  C01B2203/0415 ,  C01B2203/0495 ,  F25J2205/02 ,  F25J2205/04 ,  F25J2205/50 ,  F25J2245/02 ,  F25J2270/04

摘要： An absorption process for separating a feed gas stream having components with a spectrum of volatilities including volatile (light) components, intermediate volatility components, and least volatile (heavy) components. The disclosed process includes the steps of: (1) contacting the feed gas stream with a liquid lean solvent stream in an absorber to produce a light product gas stream that is composed of predominantly light components and a rich solvent stream containing most of the intermediate and heavy components; (2) flashing the rich solvent stream at reduced pressure in a flash zone to produce an intermediate product gas stream composed predominantly of intermediate components and a lean solvent stream; (3) conveying the lean solvent stream from the flashing zone to the absorber, wherein the lean solvent is composed predominantly of heavy components taken from the feed; the process does not use an external lean solvent. The process is particularly useful for rejecting nitrogen from natural gas and for recovering hydrogen from refinery and petrochemical process off-gases.

摘要翻译： 用于分离具有包含挥发性（轻）组分，中等挥发性组分和最不易挥发（重））组分的挥发性谱的组分的进料气流的吸收方法。 所公开的方法包括以下步骤：（1）将进料气流与吸收器中的液体贫溶剂流接触，以产生轻质产物气流，其主要由轻组分和富溶剂流组成，所述富溶剂流含有大部分中间体和/ 重部件; （2）在闪蒸区中减压蒸发富溶剂流以产生主要由中间组分和贫溶剂流组成的中间产物气流; （3）将稀溶剂流从闪蒸区输送到吸收器，其中贫溶剂主要由从进料中取出的重组分组成; 该方法不使用外部贫溶剂。 该方法特别适用于从天然气中排出氮气并从炼油厂和石油化学工艺废气中回收氢气。

公开(公告)号：US4883515A

公开(公告)日：1989-11-28

申请号：US102350

申请日：1987-09-29

申请人： Yuv R. Mehra ,  Freylon B. Coffey

发明人： Yuv R. Mehra ,  Freylon B. Coffey

IPC分类号： B01D53/14 ,  C01B3/52 ,  C01B21/04 ,  C07C7/11 ,  C10G5/04 ,  C10L3/10

CPC分类号： C10L3/10 ,  B01D53/1487 ,  B01D53/1493 ,  C01B21/0488 ,  C01B3/52 ,  C07C7/11 ,  C10G5/04 ,  C01B2210/007 ,  C10G2300/1025

摘要： A continuous process is disclosed for separating components of a hydrocarbon gas stream which are selected from the group consisting of methane, ethane, higher saturated hydrocarbons, and mixtures thereof by countercurrently contacting the hydrocarbon gas stream with a physical solvent selected from the group consisting of:(1) paraffinic solvents having molecular weights ranging from 75 to 140 and UOP characterization factors ranging from 12.0 to 13.5, these factors being independent of the aromatic content of the paraffinic solvents,(2) naphthenic solvents having molecular weights ranging from 75 to 130 and UOP characterization factors ranging from 10.5 to 12.0, these factors being independent of the aromatic content of the naphthenic solvents, and(3) benzene and toluene,to produce an overhead stream which is rich in methane and a rich solvent bottoms stream and then recovering the lean physical solvent and a C.sub.2 + hydrocarbons product from the rich solvent bottoms stream and recycling the recovered solvent stream to the contacting step.

摘要翻译： 公开了一种连续的方法，用于通过将烃气流与选自以下的物理溶剂逆流接触来分离选自甲烷，乙烷，较高级饱和烃及其混合物的烃气流的组分： （1）分子量范围为75至140，UOP表征因子范围为12.0至13.5的石蜡溶剂，这些因素与石蜡溶剂的芳族含量无关，（2）分子量范围为75至130的环烷烃溶剂和 UOP表征因子范围为10.5〜12.0，这些因素与环烷溶剂的芳香族含量无关，（3）苯和甲苯，产生富含甲烷和富溶剂塔底物流的塔顶物流，然后回收 稀的物理溶剂和来自富溶剂底部物流和回收物的C2 +烃产物 将回收的溶剂流转移到接触步骤。

公开(公告)号：US4743282A

公开(公告)日：1988-05-10

申请号：US854383

申请日：1986-04-21

申请人： Yuv R. Mehra

发明人： Yuv R. Mehra

IPC分类号： C07C7/11 ,  C10G5/04 ,  C10L3/10 ,  F25J3/00

CPC分类号： C10L3/10 ,  C07C7/11 ,  C10G5/04 ,  C10G2300/1025

摘要： A gas-liquid extractive stripping process is disclosed which uses at least one preferential physical solvent in at least one solvent loop, each loop passing through at least two unit operations: extractive-stripping and distillation. At least the first extractive-stripping operation may additionally comprise a rectification section on top of the extraction section. Three products are made from streams of thermally cracked gases or refinery gases: a hydrogen-rich gas stream, a methane-rich gas stream, and a C.sub.2 =+ hydrocarbons stream which is the feed stream for the conventional fractionation train of an olefins manufacturing facility. Ethylene can be economically produced from the C.sub.2 =+ hydrocarbons product stream at a recovery of at least 99.5% and a purity of at least 99.9%.

摘要翻译： 公开了一种气液萃取汽提方法，其在至少一个溶剂回路中使用至少一种优先物理溶剂，每个环路通过至少两个单元操作：萃取 - 汽提和蒸馏。 至少第一提取 - 剥离操作可另外包括在提取部分顶部的整流部分。 三种产品由热裂解气体或炼油厂气体制成：富氢气流，富甲烷气流和C2 = +烃流，其为烯烃制造设备常规分馏系列的进料流 。 乙烯可以从C2 = +烃产物流经济地生产，回收率至少为99.5％，纯度至少为99.9％。

公开(公告)号：US4578094A

公开(公告)日：1986-03-25

申请号：US637210

申请日：1984-08-03

申请人： Yuv R. Mehra

发明人： Yuv R. Mehra

IPC分类号： C07C7/11 ,  C10G5/04 ,  C10L3/10 ,  F25J3/02

CPC分类号： C10L3/10 ,  B01D53/263 ,  C07C7/11 ,  C10G5/04 ,  C10G2300/1025 ,  Y02C20/20

摘要： A stream of natural gas, which is rich in C.sub.5 + hydrocarbons and may be wet or dry or sweet or sour, is extracted in two stages with a physical solvent. In the first stage, a major portion of the solvent, containing up to an equilibrium amount of C.sub.5 + hydrocarbons, removes substantially all of the water and the C.sub.2 + hydrocarbons. In the second stage, the partially stripped natural gas is countercurrently extracted with a lean-and-dry minor portion of the solvent which contains less than 1% by weight of water and less than 1% by volume of hydrocarbons. The residue natural gas, which is then sent to a pipeline, contains less than 7 pounds of water per million standard cubic feet. The rich solvent is flashed to atmospheric pressure in at least two stages, forming a methane-rich vapor portion which is suitably recycled to the first extraction, a methane-poor vapor portion, and a flashed solvent containing up to equilibrium amounts of C.sub.5 + hydrocarbons. The methane-poor vapor portion is compressed, cooled, and condensed to form a liquid stream which is selectively stripped of C.sub.1, C.sub.1 +C.sub. 2, C.sub.1 +C.sub.2 +C.sub.3 or C.sub.1 +C.sub.2 +C.sub.3 +C.sub.4 to form a liquid hydrocarbon product of selected composition based on market economics. A slipstream of the flashed solvent, containing the amount of water picked up from the natural gas stream and amounting to less than 25% by weight of the flashed solvent, is all that needs to be regenerated to form the lean-and-dry minor portion.

摘要翻译： 富含C5 +烃并且可能是湿的或干的或甜的或酸的天然气流在两个阶段用物理溶剂萃取。 在第一阶段，大部分溶剂含有至多平衡量的C5 +烃，几乎除去了所有的水和C2 +烃。 在第二阶段中，部分汽提的天然气与含有小于1重量％水和小于1体积％烃的稀溶剂和少量干溶剂一起逆流萃取。 残余天然气，然后送到管道，每百万标准立方英尺含有少于7磅的水。 将富溶剂在至少两个阶段中闪蒸至大气压，形成富甲烷蒸气部分，其适当地循环到第一次萃取，甲烷不良蒸气部分和含有至多平衡量的C5 +烃的闪蒸溶剂。 无甲烷蒸汽部分被压缩，冷却和冷凝，形成液态物流，其被选择性地汽提出C1，C1 + C2，C1 + C2 + C3或C1 + C2 + C3 + C4，以形成液态烃产物 选择基于市场经济学的组合。 闪蒸溶剂的滑流含有从天然气流中吸收的水量少于闪蒸溶剂的25重量％，所有这些都需要再生以形成贫 - 干次要部分 。

公开(公告)号：US4511381A

公开(公告)日：1985-04-16

申请号：US507564

申请日：1983-06-24

申请人： Yuv R. Mehra

发明人： Yuv R. Mehra

IPC分类号： C07C7/11 ,  C10G5/04 ,  C10L3/10 ,  F25J3/02

CPC分类号： C10L3/10 ,  C07C7/11 ,  C10G5/04 ,  C10G2300/1025

摘要： A continuous process for selective countercurrent extraction of C.sub.2 + hydrocarbons from a natural gas stream with a physical solvent while at pipeline pressures to produce a residue natural gas stream meeting pipeline specifications and a liquid hydrocarbon product having a composition which can be readily adjusted to any selected degree in accordance with market conditions so that profitability of the extraction operation can be maximized at all times. The rich solvent is let down in pressure through successive flashing stages to produce a liquid product, and the stripped solvent is recirculated to the extraction step. The versatility of the process is achieved by using the following steps, in order of importance: (1) selectively varying the flow rate of the solvent with respect to the flow rate of the natural gas stream; (2) selectively varying the flashing pressure for one or more successive flashing stages; (3) recycling the flashed C.sub.1 + undesirable gases to the extraction step; and (4) rejecting selected components of the liquid product in a stripping column for the liquid hydrocarbon product by: (a) selectively varying the pressure in the column, and (b) selectively varying the temperature at the bottom of the column. The rejected components are also recycled to the extraction step and are C.sub.1, C.sub.1 +C.sub.2, C.sub.1 +C.sub.2 +C.sub.3, or C.sub.1 +C.sub.2 +C.sub.3 +C.sub.4. If water is present in significant quantities, the solvent is regenerated before recycling it to the extraction step.

摘要翻译： 一种用于在管道压力下从具有物理溶剂的天然气流中选择性逆流萃取C2 +烃的连续方法，以产生满足管道规格的残余天然气流和具有可以容易地调节至任何选定程度的组成的液体烃产物 根据市场情况，可以随时提取提取操作的盈利能力。 富溶剂通过连续闪蒸阶段降压，产生液体产物，汽提溶剂再循环至萃取步骤。 该方法的通用性通过以下重要的顺序使用以下步骤来实现：（1）相对于天然气流的流量选择性地改变溶剂的流速; （2）选择性地改变一个或多个连续闪光阶段的闪光压力; （3）将闪烁的C1 +不良气体循环到萃取步骤; 和（4）通过以下步骤排斥用于液体烃产物的汽提塔中的液体产物的选定组分：（a）选择性地改变塔中的压力，和（b）选择性地改变塔底部的温度。 被拒绝的组分也被回收到提取步骤，并且是C1，C1 + C2，C1 + C2 + C3或C1 + C2 + C3 + C4。 如果大量存在水，则在将溶液再循环到萃取步骤之前，将溶剂再生。

公开(公告)号：US5681908A

公开(公告)日：1997-10-28

申请号：US591314

申请日：1996-01-25

申请人： Yuv R. Mehra ,  Robert H. Stodghill

发明人： Yuv R. Mehra ,  Robert H. Stodghill

IPC分类号： C08J11/02 ,  B01J8/00 ,  B01J8/24 ,  C07C7/04 ,  C07C7/11 ,  C07C11/02 ,  C08F2/34 ,  C08F6/00 ,  C08F10/00

CPC分类号： B01J8/24 ,  B01J8/0035 ,  C08F10/00 ,  C08F6/005 ,  B01J2208/00256 ,  B01J2208/00274 ,  B01J2208/00292 ,  B01J2208/00761

摘要： A process for rejecting reactor byproduct from the polymerization reactor in an olefins polymerization process wherein reactor waste gas stream(s) comprising unreacted monomers, reactor byproduct and light components are treated in an absorption process to additionally recover the monomers. The absorption process comprises contacting the reactor waste gas stream(s) with an absorption solvent in an absorption zone to produce a gas stream comprising the light components, and a liquid stream comprising the absorption solvent, absorbed reactor byproduct and absorbed monomers. The liquid stream is fractionated in a distillation column to produce a distillation column bottoms stream that is the absorption solvent which is conveyed to the absorption zone, and an overhead stream comprising the monomers and reactor byproduct which is further fractionated in a splitter column to reject the reactor byproduct as a bottoms stream. The recovered monomers from the splitter overhead can be conveyed to the reactor. In a preferred embodiment, the absorption solvent consists essentially of components derived from the reactor waste gas stream(s) so that no external solvent is required.

摘要翻译： 在烯烃聚合方法中从聚合反应器中排出反应器副产物的方法，其中在吸收过程中处理包含未反应单体，反应器副产物和轻组分的反应器废气流以另外回收单体。 吸收过程包括使反应器废气流与吸收区中的吸收溶剂接触以产生包含轻组分的气流，以及包含吸收溶剂，吸收的反应器副产物和吸收的单体的液体流。 将液体流在蒸馏塔中分馏，以产生蒸馏塔塔底物流，其是被输送到吸收区的吸收溶剂，以及包含单体和反应器副产物的塔顶物流，其在分离塔中进一步分馏以排除 反应器副产物作为底部物流。 来自分离器塔顶的回收的单体可以被输送到反应器。 在优选的实施方案中，吸收溶剂基本上由衍生自反应器废气流的组分组成，使得不需要外部溶剂。

公开(公告)号：US5551972A

公开(公告)日：1996-09-03

申请号：US518145

申请日：1995-08-23

申请人： Glenn C. Wood ,  Yuv R. Mehra

发明人： Glenn C. Wood ,  Yuv R. Mehra

IPC分类号： B01D53/14 ,  C01B3/52 ,  C07C7/11 ,  C10G5/04 ,  C10L3/10 ,  F25J3/02 ,  B01D47/14

CPC分类号： B01D53/14 ,  B01D53/1493 ,  C01B3/52 ,  C07C7/11 ,  C10G5/04 ,  C10L3/10 ,  F25J3/0209 ,  F25J3/0233 ,  F25J3/0238 ,  F25J3/0257 ,  F25J3/029 ,  C01B2203/0415 ,  C01B2203/0495 ,  F25J2205/02 ,  F25J2205/04 ,  F25J2205/50 ,  F25J2245/02 ,  F25J2270/04

摘要： An absorption process for separating a feed gas stream having components with a spectrum of volatilities including volatile (light) components, intermediate volatility components, and least volatile (heavy) components. The disclosed process includes the steps of: (1) contacting the feed gas stream with an internally generated liquid lean solvent stream in an absorber to produce a light product gas stream that is composed of predominantly light components and a rich solvent stream containing most of the intermediate and heavy components; (2) flashing the rich solvent stream at reduced pressure in a flash zone to produce an intermediate product gas stream composed predominantly of intermediate components and a lean solvent stream; (3) conveying the lean solvent stream from the flashing zone to the absorber, wherein the lean solvent is composed predominantly of heavy components supplied from the feed; the process does not use an external lean solvent. The process is particularly useful for rejecting nitrogen from natural gas and for recovering hydrogen from refinery and petrochemical process offgases.

摘要翻译： 用于分离具有包含挥发性（轻）组分，中等挥发性组分和最不易挥发（重））组分的挥发性谱的成分的进料气流的吸收方法。 所公开的方法包括以下步骤：（1）将进料气流与内部产生的液体贫的溶剂流接触在吸收器中以产生轻质产物气流，其主要由轻组分和富溶剂流组成，所述富溶剂流含有 中间和重组分; （2）在闪蒸区中减压蒸发富溶剂流以产生主要由中间组分和贫溶剂流组成的中间产物气流; （3）将稀溶剂流从闪蒸区输送到吸收器，其中贫溶剂主要由从进料供给的重组分组成; 该方法不使用外部贫溶剂。 该方法对于从天然气中排除氮气和从炼油厂和石化工艺废气中回收氢气特别有用。

公开(公告)号：US5326929A

公开(公告)日：1994-07-05

申请号：US937156

申请日：1992-08-31

申请人： Yuv R. Mehra ,  Wilfred K. Lam ,  Dow W. Mullins

发明人： Yuv R. Mehra ,  Wilfred K. Lam ,  Dow W. Mullins

IPC分类号： C07C7/11 ,  C07C11/04 ,  C10G5/04 ,  C10G70/04 ,  C10G70/06 ,  F25J3/00 ,  C07C7/00 ,  B01D19/00

CPC分类号： C10G70/041 ,  C10G5/04 ,  C10G70/06 ,  Y02P20/132

摘要： A continuous process is described for contacting an olefins-containing feed gas stream, which has been freed of CO.sub.2 and sulfur compounds, compressed, cooled, and dried, with a solvent in an intercooled and reboiled demethanizing absorber to produce a rich solvent bottom stream containing ethylene and heavier hydrocarbons and an absorber overhead stream which is fed to a methane absorber which recovers a hydrogen product stream as overhead and produces a rich solvent stream as bottoms. When recovering up to 50% of the incoming hydrogen, this rich solvent stream from the methane absorber is fed to the demethanizing absorber, but when recovering from 20% to 100% of the incoming hydrogen, this rich solvent stream is recycled in part to the demethanizing absorber and in part is fed to a methane stripper which sends its bottoms to the methane absorber and its overhead to an auto refrigerated recovery unit which removes H.sub.2, CH.sub.4, and CO as a fuel gas product and produces an ethylene and heavier stream. The rich solvent stream from the demethanizing absorber is separated in a solvent regenerator into an overhead stream of ethylene and heavier hydrocarbons and a bottom lean solvent stream for recycle to the methane absorber and then to the demethanizing absorber. The bottom stream of the recovery unit and the overhead stream of the solvent regenerator are combined to form an ethylene and heavier product stream.

摘要翻译： 描述了一种连续方法，用于使中间冷却和再沸腾的脱甲烷吸收器中的溶剂与已经没有CO 2和硫化合物的含烯烃的进料气流一起被压缩，冷却和干燥，以产生含有 乙烯和较重的烃和一种吸收剂塔顶物流，其被送入甲烷吸收器，其回收氢产物流作为塔顶馏出物并产生作为塔底物的富溶剂流。 当回收高达50％的进入氢气时，来自甲烷吸收器的富溶剂流被进料到脱甲烷吸收剂，但是当从20％至100％的进入氢气回收时，该富溶剂流部分地再循环到 脱甲烷吸收剂部分被送入甲烷汽提塔，甲烷汽提塔将其塔底产物送至甲烷吸收塔及其顶部至自动冷藏回收装置，该单元除去作为燃料气体产物的H 2，CH 4和CO，并产生乙烯和较重物流。 来自脱甲烷吸收剂的富溶剂流在溶剂再生器中分离成乙烯和较重烃的顶部物流和底部贫溶剂流，用于再循环到甲烷吸收器，然后再到脱甲烷吸收器。 回收单元的底部流和溶剂再生器的塔顶流合并形成乙烯和较重的产物流。

公开(公告)号：US5220097A

公开(公告)日：1993-06-15

申请号：US836911

申请日：1992-02-19

申请人： Wilfred K. Lam ,  Yuv R. Mehra ,  Don W. Mullins

发明人： Wilfred K. Lam ,  Yuv R. Mehra ,  Don W. Mullins

IPC分类号： C10G5/04 ,  C10G70/04 ,  C10G70/06

CPC分类号： C10G5/04 ,  C10G70/041 ,  C10G70/06

摘要： A continuous process is described for contacting an olefins-containing feed gas stream, freed of CO.sub.2 and sulfur compounds, in a front-end heat-pumped depropanizer to remove the C.sub.4+ compounds, selectively hydrogenating the overhead stream to significantly reduce the acetylene and diolefins content, dehydrating the reactor effluent to remove traces of moisture, feeding the dehydrated stream to an intercooled and reboiled demethanizing absorber to produce a rich solvent containing ethylene and heavier hydrocarbons, feeding the absorber overhead stream to an auto refrigerated recovery unit to remove hydrogen, methane, and CO as overhead to a fuel gas system, separating the rich solvent in a solvent regenerator into an overhead stream of ethylene and heavier hydrocarbons and a bottom lean solvent stream for recycle to the demethanizing absorber, combining the overhead of the solvent regenerator with the bottoms of the demethanizer in the auto refrigerated recovery unit, and feeding the combined stream to a deethanizer which produces an overhead stream that is split into ethylene as product and ethane for recycling to the cracker.

摘要翻译： 描述了一种连续方法，用于使前端热泵式去丙烷化器中的含烯烃的进料气流（不含CO 2和硫化合物）接触以除去C4 +化合物，选择性地使塔顶馏出物氢化以显着降低乙炔和二烯烃含量 将反应器流出物脱水以除去痕量的水分，将脱水物流送入中间冷却和再沸腾的脱甲烷吸收器中以产生含有乙烯和较重烃的富溶剂，将吸收剂塔顶流送入自动冷藏回收单元以除去氢气，甲烷， 和CO作为燃料气体系统的开销，将溶剂再生器中的富溶剂分离成乙烯和较重烃的塔顶馏出物流和底部贫溶剂流，以再循环到脱甲烷吸收剂，将溶剂再生器的塔顶馏出物与塔底物 的脱甲烷塔在自动冷藏回收单元中，并送入梳子 流入脱乙烷塔，其产生分离成乙烯作为产物的塔顶馏出物和用于回收到裂解器的乙烷。