摘要:
The present disclosure provides a premixer for at least two gases, comprising: a tabular body having a closed end and an opposite, open end; a first flow passage for receiving a first gas, the first flow passage axially extending through the closed end into the tabular body in a sealable manner; a conical tube arranged in the tabular body, wherein a small end of the conical tube communicates with the first flow passage, and a large end of the conical tube extends toward the open end with an edge thereof being fixed to an inner wall of the tabular body, thereby defining a sealed distribution chamber between the tabular body and the conical tube; and a second flow passage arranged on a side portion of the tabular body for receiving a second gas, wherein the second flow passage communicates with the distribution chamber, so that the second gas can be introduced into said conical tube via the distribution chamber in a substantially radial manner. The present disclosure further relates to a radially fixed bed reactor comprising the premixer, a reaction system of oxidative dehydrogenation of butene comprising the racially fixed bed reactor, and a corresponding process.
摘要:
The present disclosure provides a catalyst for oxidative dehydrogenation of butene to butadiene, comprising at least one compound of formula ZnaAlbMcFeeOf.Z(α-Fe2O3), wherein M is at least one element chosen from Be, Mg, Ca, Sr, Mn, Ba, Cu, Co, and Ni, Z represents the percentage by weight of α-Fe2O3 in the catalyst and ranges from 10% to 70%. Also provided herein is a process of preparing said catalyst and the use of said catalyst in an oxidative dehydrogenation of butene to butadiene processes.
摘要翻译:本公开内容提供了一种用于将丁烯氧化脱氢成丁二烯的催化剂,其包含至少一种式ZnaAlbMcFeeOf.Z(α-Fe2O3)化合物,其中M为选自Be,Mg,Ca,Sr,Mn,Ba ,Cu,Co和Ni中,Z表示催化剂中α-Fe 2 O 3的重量百分数,为10〜70%。 本文还提供了制备所述催化剂的方法和所述催化剂在丁烯到丁二烯过程的氧化脱氢中的用途。
摘要:
A process for producing ethylene glycol includes contacting an oxalate with a fluidized bed catalyst under the following conditions: a reaction temperature of from about 170 to about 270° C., a weight space velocity of oxalate of from about 0.2 to about 7 hours−1, a hydrogen/ester molar ratio of about 20˜200:1, a reaction pressure of from about 1.5 to about 10 MPa, and a reaction temperature difference T of from about 1 to about 15° C. The fluidized bed catalyst includes: a) from about 5 to about 80 parts by weight of copper and the oxide thereof, b) from about 10 to about 90 parts by weight of at least one carrier selected from silica, molecular sieve or alumina, c) from about 0.01 to about 30 parts by weight of bismuth and tungsten metallic elements or the oxides thereof, or cerium and niobium metallic elements or the oxides thereof.
摘要:
This invention relates to a supported quaternary phosphonium catalyst, preparation thereof and use thereof in producing dialkyl carbonates. The supported quaternary phosphonium catalyst of this invention has the following average molecular structure (I), and is characterized by a relatively high and stable catalyst activity. wherein, each of X, L, n, R1, R2, R3 and is the same as that in the specification.
摘要:
A process of producing isopropyl benzene which solves the problem of high amount of n-propyl benzene according to the prior art. The process separates the polyisopropyl benzene through a suitable rectification into two streams of relatively lighter and heavier components, wherein the content of diisopropylbenzene in the stream of relatively lighter components is controlled to be at least greater than 95 wt %, and the content of tri-isopropyl benzene in the stream of relatively heavier components is controlled to be at least greater than 0.5 wt %. Such a technical solution subjecting the two streams respectively to the transalkylation solves the problem raised from the prior art, and is useful for the industrial production of isopropyl benzene.
摘要:
The present invention relates to a process of producing oxalate by CO gas phase method for chiefly solving the technical problem of the low utilization efficiency of nitrogen oxides or nitrous acid esters in the prior art. The present invention solves the problem in a better way by using the following steps including: a gas phase stream V containing NO and methanol and oxygen enter a supergravity rotating bed reactor II and are subjected to the oxidative esterification reaction to produce an effluent VI containing methyl nitrite; a methyl nitrite effluent VII obtained from separating said effluent VI together with a CO gas II enter a coupling reactor II and is contacted with a catalyst II to react to form a dimethyl oxalate effluent VIII and a gas phase effluent IX containing NO; the resultant dimethyl oxalate effluent VIII is separated to obtain a dimethyl oxalate product I; optionally, the gas phase effluent IX containing NO is returned to the step above so as to be mixed with the gas phase stream V containing NO for being recycled. Therefore, the process is applicable to the industrial production of oxalate by CO gas phase method.
摘要:
The invention provides a start-up method for a reaction-regeneration unit for preparing light olefins from methanol, which comprises: (a) heating a regenerator with an auxiliary combustion chamber and a reactor with a start-up furnace; (b) charging a catalyst into the regenerator and reactor; (c) closing a spent catalyst slide valve and a regenerated catalyst slide valve after the reactor reaches about 350° C. or more; (d) feeding methanol to the reactor after the dense phase stage of the regenerator reaches about 350° C. or more; (e) opening the spent catalyst slide valve and introducing a carbon deposited catalyst from the reactor to the regenerator after the dense phase stage reaches about 400° C. or more and the average amount of carbon deposits on the catalyst in the reactor reaches about 2.5% or more; (f) raising the regenerator to above about 580° C.; and (g) stopping the start-up furnace and auxiliary combustion chamber.
摘要:
A process of producing C1-C4 alkyl nitrite, comprising the following steps: a) firstly feeding nitrogen oxide and oxygen into Reactor I, contacting with an aluminosilicate catalyst, and reacting to produce an effluent I containing NO2 and unreacted NO; b) feeding the effluent I and C1-C4 alkanol into Reactor II, and reacting to produce an effluent II containing C1-C4 alkyl nitrite; and c) separating the effluent II containing C1-C4 alkyl nitrite to obtain C1-C4 alkyl nitrite; wherein reactor I is a fixed bed reactor, and Reactor II is a rotating high-gravity reactor; said nitrogen oxide in step a) is NO, or a mixed gas containing NO and one or more of N2O3 and NO2, wherein the molar number of NO is greater than that of NO2, if any; and the molar ratio of NO in nitrogen oxide to oxygen is 4-25:1.
摘要:
The present invention provides a catalyst comprising metallic Pt and/or Pd supported on a binder-free zeolite for producing light aromatic hydrocarbons and light alkanes from hydrocarbonaceous feedstock, wherein the amount of metallic Pt and/or Pd is of 0.01-0.8 wt %, preferably 0.01-0.5 wt % on the basis of the total weight of the catalyst, and the binder-free zeolite is selected from the group consisting of mordenite, beta zeolite, Y zeolite, ZSM-5, ZSM-11 and composite or cocrystal zeolite thereof. The present invention also provides a process for producing light aromatic hydrocarbons and light alkanes from hydrocarbonaceous feedstock using said catalyst.
摘要:
Provided are processes for producing an oxalate by coupling of CO in the presence of a nitrite, wherein two or more reaction zones in series are used, and at least a portion of the oxalate as reaction product is separated between the reaction zones, and/or the nitrite is fed stagewise. The processes described herein can effectively enhance the selectivity to the oxalate and the single-pass conversion of the feedstock.