摘要:
The present invention comprises a process for producing propylene comprising the steps of contacting an olefin feed containing between about 40 and about 80 wt-% olefins and between about 20 and about 60 wt-% olefins and aromatics with a spherical catalyst to form a cracked product, the catalyst comprising about 30 to about 80 wt-% of a crystalline zeolite, the reaction conditions including a temperature from about 500° to 650° C., a hydrocarbon partial pressure of 70 to 280 kPa (10 to 40 psia), a liquid hourly space velocity in the range of 5 to 40 hr−1 and wherein propylene comprises at least 90 mol-% of the total C3 products.
摘要翻译:本发明包括一种生产丙烯的方法,包括以下步骤:将含有约40至约80重量%的烯烃和约20至约60重量%的烯烃和芳族化合物的烯烃进料与球形催化剂接触以形成裂化产物 ,催化剂包含约30至约80重量%的结晶沸石,反应条件包括约500℃至650℃的温度,70至280kPa(10至40psia)的烃分压, 在5至40小时-1的范围内的液时空速,其中丙烯占总C 3 N 3产物的至少90摩尔%。
摘要:
A process and apparatus cools a heat exchange type reaction zone by passing the incoming reactants through heat exchange channels in heat exchange relationship with the reaction zone. The invention simplifies the operation and construction of the heat exchanging type reaction zone by directly communicating reaction channels that contain the reaction with the heating channels that heat reactant across an open manifold located at the end of the channels. Additional reactants, cooling fluids, or other diluents may enter the process directly through the manifold space to permit further temperature control of the reaction zone. The invention promotes better heat transfer efficiency than tube and shell heat transfer arrangements that have been used for similar purposes. The narrow channels are preferably defined by corrugated plates. The reaction channels will contain a catalyst for the promotion of the primary reaction.
摘要:
Processes for the production of ethers from alcohols and isoolefins are disclosed. Isoolefins having four to five carbon atoms per molecule are combined with a monohydroxy alcohol having from one to five carbon atoms per molecule and with a recycle stream comprising alcohol and water to form an etherification zone feed stream which is passed through an etherification zone to produce the desired ether. The effluent from the etherification zone is separated into an ether product and an aqueous product containing unreacted alcohol which is recycled to provide a portion of the etherification zone feed stream. Distillation can be employed to separate the effluent from the etherification zone into a bottoms product stream, comprising the ether, a distillate product comprising other hydrocarbons and the above-mentioned recycle stream. When producing ethyl-tertiary-butyl ether (ETBE), azeotropic grade ethanol, i.e., about 5 vol. % water, is preferably utilized. The utilization of the alcohol/water recycle stream can obviate the need for additional alcohol recovery from the distillate product.
摘要:
A multistep hydrocarbon conversion process for the production of ethers including methyl tertiary butyl ether (MTBE) from light paraffins and alcohols is disclosed. A mixture of C.sub.4 isoparaffins, normal paraffins, an etherification recycle and butane isomerization effluent enter a deisobutanizer column. Normal paraffins withdrawn from the fractionator are isomerized and returned to the fractionator, and isoparaffins are withdrawn from the fractionator and dehyrogenated. The resulting olefins enter an etherification zone for reaction of isobutene with a C.sub.2 -C.sub.5 alcohol. Unreacted paraffins and olefins comprise the etherification effluent entering the deisobutanizer. Normal butanes and olefins are withdrawn as a sidecut from the deisobutanizer. Hydrogenation of the sidecut saturates any olefins contained therein which would interfere with the isomerization of normal butanes. The saturated sidecut passes to an isomerization zone and a mixture of isobutane and normal butane is recycled to the deisobutanizer. In a highly perferred embodiment, spent catalyst from the isomerization zone fulfills the catalyst requirement of the dehydrogenation zone.
摘要:
The present process provides a method for converting an oxygenate-containing feed stream to an olefin-containing product stream. The method includes: (1) providing a first fluidized catalytic reactor for converting methanol to propylene, the first reactor having a fluidized catalyst system comprising a first catalyst and a second catalyst; (2) providing a second fluidized catalytic reactor communicating with the first fluidized catalytic reactor for cracking heavy olefins having four carbon atoms or greater into propylene, the second reactor having the fluidized catalyst system; (3) providing an oxygenate containing feed to the first reactor; and (4) fluidizing the catalyst system with the oxygenate containing feed.
摘要:
The present invention provides a reactor system for converting an oxygenate-containing feed stream to an olefin-containing product stream. The system includes: (1) a first fluidized catalytic reactor for converting methanol to propylene, the first reactor having a fluidized catalyst system comprising a first catalyst and a second catalyst; (2) a second fluidized catalytic reactor communicating with the first fluidized catalytic reactor for cracking heavy olefins having four carbon atoms or greater into propylene, the second reactor having the fluidized catalyst system; (3) wherein the first catalyst is a non-zeolite molecular sieve catalyst; and (4) wherein the second catalyst is a zeolite molecular sieve catalyst.
摘要:
The present invention provides a reactor system for converting an oxygenate-containing feed stream to an olefin-containing product stream. The system includes: (1) a first fluidized catalytic reactor for converting methanol to propylene, the first reactor having a fluidized catalyst system comprising a first catalyst and a second catalyst; (2) a second fluidized catalytic reactor communicating with the first fluidized catalytic reactor for cracking heavy olefins having four carbon atoms or greater into propylene, the second reactor having the fluidized catalyst system; (3) wherein the first catalyst is a non-zeolite molecular sieve catalyst; and (4) wherein the second catalyst is a zeolite molecular sieve catalyst.
摘要:
Carbonyl compounds (e.g. acetone and acetaldehyde) are often present as impurities in oxygenated organic liquids such as acetic acid made by the carbonylation of methanol or in phenol produced by the oxidation of cumene. These impurities can render petrochemical products unsuitable for long-term storage or otherwise adversely affect downstream processing operations. It has now been found that detrimental carbonyl impurities can be easily removed from oxygenated organic liquids by contact with resins having amine functional groups.
摘要:
A reactor arrangement and process for indirectly contacting a reactant stream with a heat exchange stream uses an arrangement of heat exchange plates to control temperature conditions by varying the heat transfer factor in different portions of a continuous channel defined by the heat exchange plates. The reactor arrangement and process of this invention may be used to operate a reactor under isothermal or other controlled temperature conditions. The variation in the heat transfer factor within a single heat exchange section is highly useful in maintaining a desired temperature profile in an arrangement having a cross-flow of heat exchange medium relative to reactants. The corrugations arrangement eliminates or minimizes the typical step-wise approach to isothermal conditions.
摘要:
Phenol is produced from a hydrocarbon feedstock using a process combination offering unexpected synergy. Benzene is produced from the hydrocarbon feedstock using a highly selective aromatization catalyst which provides substantial quantities of high-purity hydrogen. The hydrogen is converted to hydrogen peroxide, which in turn is used to convert the benzene to phenol in high yield.