摘要:
A method for directly producing an aromatic hydrocarbon from synthesis gas. The method comprises: a) enabling a feed stream comprising synthesis gas to contact a catalyst in a reaction zone under a reaction condition sufficient to convert at least a portion of the raw materials to obtain a reaction effluent; b) separating the reaction effluent to obtain at least a recycle stream comprising gas hydrocarbons having 1-4 carbon atoms and unconverted synthesis gas as well as a liquid stream comprising hydrocarbons having 5 or more carbon atoms; c) returning the recycle stream to the reaction zone; and d) separating the aromatic hydrocarbon product from the liquid stream, wherein the catalyst comprises an inert carrier-confinement high-dispersion metal oxide material, acidic molecular sieve, and at least one of graphite powder and dispersing agent optionally.
摘要:
Provided is a method for directly preparing dimethyl ether by synthesis gas, the method comprises: the synthesis gas is passed through a reaction zone carrying a catalyst, and reacted under the reaction conditions sufficient to convert at least a portion of the raw materials to obtain the reaction effluent comprising dimethyl ether; and the dimethyl ether is separated from the reaction effluent, wherein the catalyst is zinc aluminum spinel oxide. In the present invention, only one zinc aluminum spinel oxide catalyst is used, which can make the synthesis gas to highly selectively form dimethyl ether, the catalyst has good stability and can be regenerated. The method of the present invention realizes the production of dimethyl ether in one step by the synthesis gas, and reduces the large energy consumption problem caused by step-by-step production.
摘要:
A method for directly producing methyl acetate and/or acetic acid from syngas, whose reaction process is carried out in at least two reaction zones, the method comprises: feeding a raw material containing syngas into a first reaction zone to contact and react with a metal catalyst; allowing an obtained effluent to enter a second reaction zone directly or after the addition of carbon monoxide so as to contact and react with a solid acid catalyst; separating the obtained effluent to obtain product of acetate and/or acetic acid, and optionally returning a residual part to enter the first reaction zone and/or the second reaction zone to recycle the reaction. The present application provides a novel method for directly converting syngas into methyl acetate and/or acetic acid, the method having a simple processing procedure and high product selectivity. According to the method, the product selectivity of the product of methyl acetate or acetic acid is greater than 93%, and the quantity of methyl acetate and acetic acid may be adjusted according to processing, thus the method has great industrial application prospects.
摘要:
A modified catalyst is described which can be used as a dehydration/hydrogenation catalyst in a multi-stage catalyst system for the catalysed production of saturated hydrocarbons from carbon oxides and hydrogen. The modified catalyst comprises: an acidic substrate comprising an M1 -zeolite or M1- silicoalumino phosphate (SAPO) catalyst, where M1 is a metal; and a modifier including a metal M2. M2 comprises an alkali metal or alkaline earth metal. In examples described the modifier includes a Group II metal, for example Ca.
摘要:
Disclosed by the present application is a method for producing methyl acetate by means of the carbonylation of dimethyl ether. The method comprises: passing dimethyl ether and a feed gas comprising carbon monoxide through a reactor loaded with a solid acid catalyst for reaction so as to produce methyl acetate, the molar ratio of carbon monoxide to dimethyl ether being 0.05:1-0.5: 1. The described method has the advantages of a low molar ratio of carbon monoxide to dimethyl ether, a high conversionrate of carbon monoxide, a small gas circulation amount, low opertion costs and so on.
摘要:
Provided are a molecular sieve catalyst, a preparation method therefor, an application thereof. The molecular sieve catalyst contains a modified Na-MOR molecular sieve, and the modification comprises: organic ammonium salt exchange, dealumination treatment, and ammonium ion exchange. The catalyst obtained by the method is used in dimethyl ether for one-step production of methyl acetate. The catalyst has high activity and stable performance, and the needs of industrial production can be satisfied.
摘要:
Disclosed is a method for directly preparing p-xylene from synthetic gas and an aromatic hydrocarbon. The method comprises: enabling a raw material containing synthetic gas and an aromatic hydrocarbon other than p-xylene to be contacted with a catalyst in a reaction zone under a reaction condition sufficient to convert at least part of the raw material, so as to obtain a reaction effluent containing p-xylene; and separating p-xylene from the reaction effluent. The catalyst contains at least one of an inert carrier limited-range high-dispersion metal oxide material, an acidic molecular sieve, and optional graphite powder, and a dispersing agent; in the inert carrier limited-range high-dispersion metal oxide material, the inert carrier is at least one of silicon oxide and aluminum oxide, and the metal oxide has a metal content of being less than or equal to 10 mass%; the inert carrier limited-range high-dispersion metal oxide material is measured by weight; the acidic molecular sieve is selected from a modified acidic ZSM-5 molecular sieve, a modified acidic ZSM-11 molecular sieve, and a mixture thereof.
摘要:
Disclosed herein is a method for directly producing ethanol from syngas, whose the reaction process is carried out in three reaction zones, and the method comprises: feeding a raw material containing syngas and dimethyl ether into a first reaction zone to contact with a solid acid catalyst, reacting; allowing the effluent from the first reaction zone to enter a second reaction zone to contact with a metal catalyst and react; separating the effluent from the second reaction zone to obtain product ethanol and by-product methanol; allowing by-product methanol to enter a third reaction zone to perform a dehydration reaction to obtain dimethyl ether, and allowing the obtained dimethyl ether to enter the first reaction zone to recycle the reaction. The present invention provides a novel method for directly converting syngas to ethanol. According to the method of the present invention, an ethanol product can be directly produced by using syngas as a raw material. Meanwhile, the method of the present invention has a simple processing procedure, low energy consumption, low production costs, and high product selectivity, and has great industrial application prospects.
摘要:
Provided is a method for preparing a lower unsaturated fatty acid ester, which comprises carrying out an aldol condensation reaction between dimethoxymethane (DMM) and a lower acid or ester with a molecular formula of R 1 -CH 2 -COO-R 2 on an acidic molecular sieve catalyst in an inert atmosphere to obtain a lower unsaturated fatty acid or ester(CH 2 = C(R 1 )-COO-R 2 ), wherein R 1 and R 2 are groups each independently selected from the group consisting of H- and C 1 -C 4 saturated alkyl group.
摘要:
A catalyst composition is provided for use in the conversion of carbon oxide(s) to saturated hydrocarbons. The catalyst composition comprises a carbon oxide(s) conversion catalyst; and a dehydration/hydrogenation catalyst comprising a silicoalumino phosphate (SAPO) molecular sieve and a metal M, for example Pd. In one embodiment, the target saturated hydrocarbons include LPG, the SAPO comprises SAPO-5 and/or SAPO-37.