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A kind of synthetic gas one-step method for producing methyl acetate

A technology of methyl acetate and synthesis gas, which is applied in the direction of carbon monoxide or formate reaction preparation, organic chemistry, etc., can solve the problem of dimethyl ether carbonylation reaction activity decline, etc., and achieve a simple and controllable preparation process with good stability , the effect of high product selectivity

Active Publication Date: 2020-11-03
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, studies have also found that the water generated during the conversion of syngas will lead to a decrease in the activity of dimethyl ether carbonylation (Angew.Chem.Int.Ed.2006,45,1617-1620)

Method used

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  • A kind of synthetic gas one-step method for producing methyl acetate

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Effect test

Embodiment 1

[0027] Weigh 0.2g Cu-ZnO (Cu mass fraction is 40%) and 0.4g HZSM-5 (Si / Al=25), shape them separately, carry out physical mixing, then weigh 0.6g HMOR (Si / Al=13) . The physically mixed catalyst is placed in the upper layer of the fixed bed reactor, and the HMOR is placed in the lower layer. Inject 5%H 2 / Ar mixed gas, heated to 300°C at a heating rate of 10°C / min to pretreat the catalyst, and kept for 300min. After being lowered to room temperature, synthesis gas was introduced, where H 2 The / CO ratio is 2 and the airspeed is 1000h -1 1. Under the condition that the reaction temperature is 220° C. and the reaction pressure is 3.0 MPa, the product is obtained through catalyst bed reaction. The reaction products and feed gas were analyzed online by gas chromatography. The specific reaction performance results are listed in Table 1.

Embodiment 2

[0029] Weigh 0.2g Cu-ZnO (Cu mass fraction is 40%) and 0.4g HBeta (Si / Al=50), shape them separately, carry out physical mixing, and weigh 0.6g HMOR (Si / Al=13). The physically mixed catalyst is placed in the upper layer of the fixed bed reactor, and the HMOR is placed in the lower layer. Inject 5%H 2 / Ar mixed gas, heated to 300°C at a heating rate of 10°C / min to pretreat the catalyst, and kept for 300min. After being lowered to room temperature, synthesis gas was introduced, where H 2 / CO ratio is 1, at airspeed 1500h -1 1. Under the condition that the reaction temperature is 200° C. and the reaction pressure is 3.0 MPa, the product is obtained through catalyst bed reaction. The reaction products and feed gas were analyzed online by gas chromatography. The specific reaction performance results are listed in Table 1.

Embodiment 3

[0031] Weigh 0.2g ZnO-Cr respectively 2 o 3 (Zn mass fraction is 50%) and 0.4g HY (Si / Al=5.5), after molding respectively, carry out physical mixing, and weigh 0.6g HZSM-35 (Si / Al=12). The physically mixed catalyst is placed in the upper layer of the fixed bed reactor, and HZSM-35 is placed in the lower layer. Inject 5%H 2 / Ar mixed gas, heated to 300°C at a heating rate of 10°C / min to pretreat the catalyst, and kept for 300min. After being lowered to room temperature, synthesis gas was introduced, where H 2 / CO ratio is 1, at airspeed 1500h -1 1. Under the condition that the reaction temperature is 250° C. and the reaction pressure is 4.0 MPa, the product is obtained through catalyst bed layer reaction. The reaction products and feed gas were analyzed online by gas chromatography. The specific reaction performance results are listed in Table 1.

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Abstract

A method for producing methyl acetate from synthesis gas by one-step method relates to a method for synthesizing the methyl acetate. The synthesis gas or the synthesis gas containing CO2 is used as areaction raw material, and the continuous relay reaction is carried out on a multifunctional catalyst to realize the preparation of methyl acetate by one-step method with high selectivity. In the process, the synthesis gas or the synthesis gas containing CO2 is first converted into methanol, then the methanol is dehydrated to form dimethyl ether, and further the dimethyl ether is carbonylated to obtain the methyl acetate. The one-step route significantly simplifies the reaction steps, improves catalytic efficiency, and significantly reduces costs. The used catalyst is a multifunctional composite catalyst, and the synthesis gas is converted into the methyl acetate in one step with high efficiency by designing and functionally coupling components. The target product has high selectivity, themethyl acetate selectivity is up to 90% or more, and the stability is high. By introducing a dehydration catalyst, the dehydration step and the dimethyl ether carbonylation step are separated to eliminate the interference of water to a reaction system. The preparation process is simple and controllable.

Description

technical field [0001] The present invention relates to the synthetic method of methyl acetate, particularly relate to a kind of method of synthetic gas one-step method for producing methyl acetate. Background technique [0002] Methyl acetate is an important organic solvent that can replace acetone in resins, coatings, inks, paints, adhesives, leather and other products. It is also an important raw material for the pharmaceutical industry and organic synthesis, and it is also used as one of the main raw materials for the production of ethanol First, the application prospect is broad. Methyl acetate can be obtained by carbonylation of dimethyl ether, and dimethyl ether is obtained by catalytic conversion of synthesis gas to methanol and further dehydration. This process has long steps and requires a large investment in equipment. The development of a process and catalyst for the one-step production of methyl acetate from synthesis gas with high selectivity will greatly shor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/36C07C69/14
CPCC07C67/36C07C69/14
Inventor 王野周伟康金灿史家庆何顺常浩浩成康张庆红
Owner XIAMEN UNIV
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