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Method for directly producing ethyl alcohol by synthesis gas

A synthesis gas and ethanol technology, which is applied in the production of bulk chemicals, chemical instruments and methods, and the preparation of organic compounds, can solve problems such as difficulties in large-scale popularization and application, increased production costs of ethanol, and reduced rhodium usage. The effects of reduced consumption, reduced equipment investment costs, and mild reaction conditions

Pending Publication Date: 2019-04-05
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the use of precious metal rhodium has greatly increased the production cost of ethanol, and the production of rhodium is limited, so there are great difficulties in large-scale promotion and application, which has become a bottleneck for the industrialization of this process route.
Significantly reducing the amount of rhodium used, or replacing rhodium with non-precious metal catalysts is an effective way to promote this technology to industrialization, but the current progress is relatively slow

Method used

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  • Method for directly producing ethyl alcohol by synthesis gas
  • Method for directly producing ethyl alcohol by synthesis gas
  • Method for directly producing ethyl alcohol by synthesis gas

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0053] Hydrogen form samples were prepared as follows:

[0054] Pass the Na-type molecular sieves in Table 1 through NH 4 NO 3 Hydrogen molecular sieves are obtained after ion exchange, drying and roasting. For example, the typical hydrogen-form sample preparation process is as follows: In a hydrothermal synthesis kettle, NaMOR molecular sieve powder is added to a pre-configured 1mol / L NH 4 NO 3 In the aqueous solution, the mass ratio of solid to liquid is 1:10, exchange reaction at 80° C. for 2 h under stirring, vacuum filter and wash with water. After three consecutive exchange reactions, drying at 120°C overnight, and calcining at 550°C for 4 hours, the desired catalyst sample HMOR was obtained.

[0055] The matrix-containing molded hydrogen samples were prepared by extrusion molding. For example, a typical sample preparation process is as follows: 80g Na-MOR and 20g alumina are thoroughly mixed, 5-15% nitric acid is added and kneaded, and the kneaded sample is extrude...

Embodiment 1

[0065] Catalyst 11# was used in the first reaction zone, catalyst B (copper-based catalyst) was used in the second reaction zone, and catalyst C was used in the third reaction zone.

[0066] In a fixed bed reactor, containing CO and H 2 The synthesis gas and dimethyl ether (DME) pass through the first reaction zone and the second reaction zone. The first reaction zone and the second reaction zone are located in the same reactor, wherein the dimethyl ether is completely or partially derived from CO and H 2 Methanol produced in the second reaction zone is dehydrated in the third reaction zone. See the specific reaction process figure 1 , wherein the synthesis gas and dimethyl ether used as raw materials enter the first reaction zone I to contact and react with the solid acid catalyst 11# in the first reaction zone to obtain the effluent containing methyl acetate and / or acetic acid material; the effluent from the first reaction zone enters the second reaction zone II to contact...

Embodiment 2

[0072] The first reaction zone uses different catalysts (1-10# and 12-16#, see Table 4), the second reaction zone uses catalyst B, and the third reaction zone uses catalyst C.

[0073] In a fixed bed reactor, containing CO and H 2 The synthesis gas and dimethyl ether (DME) pass through the first reaction zone and the second reaction zone together, and the first reaction zone and the second reaction zone are located in the same reactor (see the specific reaction process in figure 1 and Example 1), where the dimethyl ether comes from CO and H 2 Methanol produced in the second reaction zone is dehydrated in the third reaction zone. The reaction conditions are as follows: Different catalysts (1-10# and 12-16#, see Table 4) and catalyst B are loaded into the first reaction zone and the second reaction zone of the reactor respectively from top to bottom, and 3g and 7 g; CO, DME and H 2 The molar ratio is 2:1:12; the dimethyl ether feed is 3g / h, the reaction temperature is 215°C, ...

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Abstract

The invention discloses a method for directly producing ethyl alcohol by synthesis gas. Reaction processes are completed in three reaction areas. The method includes the steps: enabling the synthesisgas and dimethyl ether to enter a first reaction area to perform contact reaction on mixture and solid-acid catalysts; enabling effluents from the first reaction area to enter a second reaction area to perform contact reaction on the effluents and metal catalysts; separating effluents from the second reaction area to obtain product ethyl alcohol by-product methyl alcohol; enabling the by-product methyl alcohol to enter a third reaction area to perform dehydration reaction to obtain dimethyl ether, and enabling the acquired dimethyl ether to enter the first reaction area to perform circular reaction. By the novel method for directly producing the ethyl alcohol by the synthesis gas, an ethyl alcohol product can be directly produced by taking the synthesis gas as a raw material, and the method is simple in process, low in energy consumption and production cost and high in product selectivity and has a great industrial application prospect.

Description

technical field [0001] The invention relates to a method for converting syngas to produce ethanol. Background technique [0002] Ethanol is an environmentally friendly and clean fuel recognized in the world. It can be directly used as liquid fuel or mixed with gasoline to reduce the emission of carbon monoxide, hydrocarbons, particulate matter, nitrogen oxides and benzene-based harmful substances in automobile exhaust, and effectively improve my country's environmental protection. Environmental quality is of great significance to solve the problem of air pollution in our country and achieve sustainable development. The existing ethanol production processes mainly include sugar or cellulose fermentation based on biomass route and ethylene hydration method based on petroleum route. In recent years, my country's fuel ethanol production and sales have grown rapidly, and China has become the world's third largest fuel ethanol producer after the United States and Brazil. However,...

Claims

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Application Information

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IPC IPC(8): C07C29/149C07C31/08
CPCC07C29/149C07C41/09C07C51/12C07C67/37C07C31/08C07C69/14C07C43/043C07C53/08Y02P20/52
Inventor 刘红超朱文良刘中民刘勇刘世平文富利倪友明马现刚
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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