Method for preparing methanol and ethanol by methyl acetate by way of hydrogenation

A technology for the preparation of methyl acetate and hydrogen, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of low catalyst conversion rate, low product selectivity, and high reaction temperature, and achieves improved reaction conversion. High efficiency, high selectivity and low production cost

Active Publication Date: 2013-09-11
LINHAI LIANSHENG CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These acetic acid ester hydrogenation reaction methods exist the low conversion rate of the catalyst used, the product selectivity is low, the reaction temperature is high, the deficiencies such as the high energy consumption

Method used

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  • Method for preparing methanol and ethanol by methyl acetate by way of hydrogenation
  • Method for preparing methanol and ethanol by methyl acetate by way of hydrogenation
  • Method for preparing methanol and ethanol by methyl acetate by way of hydrogenation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 740g purity is that the by-product methyl acetate of the preparation polyvinyl alcohol of 60% is pumped in the high-pressure reactor by high-pressure pump, after gasification, by the catalyzer in the good 10g table 1 embodiment 1 of activation in advance, in catalyst bed In the layer, the hydrogenation reduction reaction is carried out under the conditions of a space velocity of 1.5h-1, a hydrogen-ester ratio of 30:1, a reaction temperature of 220°C, and a system pressure of 2.0MPa, and then cooled to obtain 770g of a reaction solution. Distilled methanol and ethanol. The conversion rate of the reaction is 99%, the selectivity is 98.5%, and the product content is above 99.5%.

Embodiment 2

[0032] 1480g purity is that the by-product methyl acetate of the preparation polyvinyl alcohol of 50% is pumped in the high-pressure reactor by high-pressure pump, after gasification, by the catalyzer in the embodiment 2 of 10g table 1 activated in advance, in the catalyst bed In the process, the hydrogenation reduction reaction was carried out under the conditions of a space velocity of 1.5h-1, a hydrogen-ester ratio of 30:1, a reaction temperature of 230°C, and a system pressure of 2.5MPa, and then cooled to obtain 1550g of reaction liquid, which was distilled Methanol and ethanol are obtained. The conversion rate of the reaction is 98.7%, the selectivity is 98.8%, and the product content is above 99.5%.

Embodiment 3

[0034] 2960g purity is the by-product methyl acetate of the preparation polyvinyl alcohol of 80% and is pumped in the high-pressure reactor by high-pressure pump, after gasification, by the catalyzer in the embodiment 3 of 10g table 1 activated in advance, in the catalyst bed , at an airspeed of 1.3h-1 , Hydrogen-ester ratio is 30:1, reaction temperature is 245°C, system pressure is 2.8MPa for hydrogenation reduction reaction, then cooled to obtain 3110g reaction liquid, and the reaction liquid is distilled to obtain methanol and ethanol. The reaction conversion rate is 99.5%, the selectivity is 99%, and the product content is above 99.5%.

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Abstract

The invention relates to a method for preparing methanol and ethanol by methyl acetate by way of hydrogenation. The method comprises the following steps: mixing the methyl acetate with hydrogen, wherein the mixture enters into a reactor catalyst bed layer, and performing the hydrogenation reduction reaction under the effect of a catalyst, wherein the reaction temperature is 200-260 DEG C, and the reaction pressure is 1.8-3.0MPa; first, cooling the products generated by the hydrogenation reduction reaction and then, distilling to obtain methanol and ethanol. According to the method provided by the invention, methyl acetate with the purity of byproduct of 50-99% for preparing polyvinyl alcohol is directly used as a raw material, so that the method is low in production cost. The catalyst is adopted for hydrogenation reaction on methyl acetate, so that the efficiency is high and the selectivity is high. After reaction, the product does not contain water, and methanol and ethanol can be separated through simple distillation, so that the reaction percent conversion and the product quality are improved. The catalyst is long in service life, and matters obtained by distillation can be used for the next reaction. Mechanical circulation is realized, and the demand of greenness and environment-friendliness is realized.

Description

technical field [0001] The invention relates to a method for preparing alcohol, in particular to a method for preparing methanol and ethanol by hydrogenating methyl acetate, and belongs to the technical field of chemical synthesis. Background technique [0002] Methanol (molecular formula: CH 4 O; English name: methyl alcohol), is a colorless, transparent, flammable and volatile polar liquid, and is the simplest saturated monohydric alcohol system. Methanol is widely used and is the basic organic chemical raw material and high-quality fuel. It is mainly used in the fields of fine chemicals and plastics. It can be used to manufacture various organic products such as formaldehyde, acetic acid, methyl chloride, methyl ammonia, and dimethyl sulfide, and it is also one of the important raw materials for pesticides and medicines. After deep processing, methanol can be used as a new type of clean fuel, which can be added to gasoline for blending. Methanol reacts with ammonia to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/04C07C31/08C07C29/149
CPCY02P20/52
Inventor 李美洲黄卫国陈锡贯姚素
Owner LINHAI LIANSHENG CHEM
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