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Method for preparing ethanol

A technology of ethanol and acetic acid, applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of incomplete vaporization of acetic acid, large equipment investment, and large corrosiveness, so as to reduce energy consumption and equipment investment , low conversion rate requirements, and the effect of reducing corrosion

Active Publication Date: 2022-07-26
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for preparing ethanol from acetic acid in order to overcome the problems of incomplete vaporization of acetic acid, high corrosiveness, high energy consumption and large equipment investment in the prior art.

Method used

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  • Method for preparing ethanol

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Acetic acid catalytic hydrogenation catalyst (Pt-Sn-Cu-Zn-Mg / SiO 2 Preparation of catalyst): Weigh 10 grams of strip high-purity SiO 2 Porous carrier with a diameter of 3 mm, a length of 5 mm, a pore volume of 1 ml / g, and a BET specific surface area of ​​250 cm 2 / g, the water absorption rate of the carrier was measured to be 1.2 ml / g, and the ethanol saturation adsorption rate was 1.4 ml / g. Weigh 0.038 g SnCl 2 ·2H 2 O, which was dissolved in 14 ml of ethanol to form SnCl 2 immersion liquid. The above SnCl 2 The dipping solution was slowly added dropwise to the SiO 2 The porous carrier was dried at 110° C. for 5 hours, then heated to 500° C. and calcined for 5 hours to obtain a SnO-loaded SiO2 porous carrier. 0.152 g of copper nitrate, 0.045 g of zinc nitrate and 0.105 g of magnesium nitrate were weighed and dissolved in 12 ml of deionized water to prepare a co-dipping solution. The above co-dipping solution was slowly added dropwise to the above-mentioned SnO-...

Embodiment 2

[0057] Pt-Sn-Cu-Zn-Mg / SiO 2 Preparation of catalyst: same as Example 1.

[0058] like figure 1 As shown, the acetic acid raw material 101 from outside the boundary area is boosted to the reaction pressure by the acetic acid feed pump 1, then enters the acetic acid preheater 11 to be preheated to a certain temperature, and then enters the vaporizer 2; the fresh hydrogen 103 from outside the boundary area and The circulating hydrogen 114 from the circulating hydrogen compressor 7 is mixed in a certain proportion, and the mixed hydrogen 104 is heated to a certain temperature by the hydrogen preheater 12, and enters the vaporizer 2 together with the acetic acid 102 from the acetic acid preheater 11; The nozzle on the vaporizer 2 forms a spray and enters the vaporizer 2 to achieve the purpose of vaporizing acetic acid; the acetic acid and hydrogen mixture stream 105 is heated to the feed temperature by the mixed raw material heater 13, and enters the hydrogenation reactor 3, where...

Embodiment 3

[0072] Preparation of Pt-Sn-Cu-Zn-Mg / AC catalyst: According to the method of Example 1, the difference is that the SiO 2 The porous carrier becomes coconut shell activated carbon (AC, its saturated water absorption rate is 13 ml / g, and the ethanol saturated adsorption rate is 15 ml / g), SnCl 2 ·2H 2 The amount of O was changed to 0.570 g, the amount of copper nitrate was changed to 3.422 g, the amount of zinc nitrate was changed to 2.275 g, the amount of magnesium nitrate was changed to 5.274 g, and the amount of [Pt(NH) 3 ) 4 ](NO 3 ) 2 Except that the dosage is changed to 0.180 g, the preparation process of Example 1 is repeated to obtain an activated carbon carrier supporting the respective oxides of Pt, Sn, Cu, Zn and Mg, that is, a catalyst precursor (a catalyst that is not activated by reduction), and the activated carbon carrier after reduction activation is obtained. The chemical composition is Pt:carrier weight ratio / Pt:Sn:Cu:Zn:Mg mass ratio of 9:100 / 0.9:3:9:5:5. ...

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Abstract

The invention relates to the field of ethanol preparation, and discloses a method for preparing ethanol. The acetic acid raw material and hydrogen gas boosted to the reaction pressure are respectively preheated and then enter a spray-type vaporizer for mixed gasification, and the hydrogen and acetic acid mixture flows through heating after gasification. Then it enters the hydrogenation reactor for catalytic hydrogenation reaction, and the reaction product is cooled and then enters the rectification tower, and the liquid phase at the bottom of the tower is separated and obtained as unreacted acetic acid. , and the remaining liquid phase is further cooled into a gas-liquid separator to separate crude ethanol product and tail gas, and the crude ethanol product is purified to obtain ethanol product. The invention has the characteristics of complete vaporization of acetic acid, less corrosiveness to equipment, low energy consumption and equipment investment, low requirements for catalyst conversion rate, and wide applicability.

Description

technical field [0001] The invention relates to the field of preparation of ethanol, in particular to a method for preparing ethanol by utilizing acetic acid. Background technique [0002] Ethanol, commonly known as alcohol, is an important chemical raw material and liquid fuel. At present, the largest amount of ethanol is used as fuel, and ethanol is added to gasoline to prepare ethanol gasoline. The development of fuel ethanol can protect the environment, alleviate air pollution, reduce greenhouse gas emissions, improve national energy security, and reduce dependence on crude oil imports. In September 2017, fifteen ministries and commissions jointly issued the "Implementation Plan on Expanding the Production of Biofuel Ethanol and Promoting the Use of Ethanol Gasoline for Vehicles", and it is expected that the domestic demand for fuel ethanol will gradually expand. In 2016, my country's gasoline consumption was 120 million tons. If all gasoline is replaced with ethanol g...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C29/149C07C31/08
CPCC07C29/149C07C31/08
Inventor 陈强孟祥堃姚金松张雪冰胡云剑田树勋龙俊英佟瑞利李永龙孙琦
Owner CHNA ENERGY INVESTMENT CORP LTD
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