Method and equipment for producing acetal through catalytic distillation

A technology of catalytic rectification and production equipment, which is applied in the field of catalytic rectification and the production of acetal by catalytic rectification, which can solve the problems of difficult catalyst recovery, long production cycle and low conversion rate, and achieve easy replacement, non-wearing and high activity high effect

Inactive Publication Date: 2013-04-24
FUQING BRANCH OF FUJIAN NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the reaction process is limited by thermodynamics, a large amount of water is generated in the reaction, and acetal, ethanol and water can form an azeotrope, which makes separation difficult, so the conversion rate of the batch reaction is low, the production cycle is long, and the energy consumption is high. , in addition, the catalyst used is difficult to recover and highly corrosive

Method used

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  • Method and equipment for producing acetal through catalytic distillation
  • Method and equipment for producing acetal through catalytic distillation
  • Method and equipment for producing acetal through catalytic distillation

Examples

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Embodiment 1

[0029] with attached figure 1 As shown in the process flow, the raw material ethanol is preheated by the preheater, the flow rate is 1.3 L / h, the temperature is 60 °C, the flow rate of the raw material acetaldehyde solution (40%wt) is 0.8 L / h, the temperature is 30 °C, respectively enters the catalytic refining In the lower and upper parts of the reaction section of the distillation tower, the molar ratio of ethanol to acetaldehyde is 2.8:1. Under the action of the catalyst cation exchange resin, the two raw materials undergo acetal reaction in the reaction section, and conduct vapor-liquid mass transfer to realize continuous catalysis The process of distillation.

[0030] The material of the catalytic rectification tower body is SUS304, and the rectification section and the stripping section are filled with CY700 regular wire mesh corrugated packing. The number of theoretical plates in the rectification section is 15, the theoretical plate number in the reaction section is 15...

Embodiment 2

[0036] with attached figure 1 As shown in the process flow, the raw material ethanol is preheated by the preheater, the flow rate is 4.2 L / h, the temperature is 65 °C, the flow rate of the raw material acetaldehyde solution (40%wt) is 2.6 L / h, the temperature is 30 °C, respectively enters the catalytic refining In the lower and upper parts of the reaction section of the distillation tower, the molar ratio of ethanol to acetaldehyde is 2.9:1. Under the action of the catalyst cation exchange resin, the two raw materials undergo acetal reaction in the reaction section, and conduct vapor-liquid mass transfer to realize continuous catalysis The process of distillation.

[0037] The material of the catalytic rectification tower body is SUS304, and the rectification section and the stripping section are filled with CY700 regular wire mesh corrugated packing. The number of theoretical plates in the rectification section is 10, the theoretical plate number in the reaction section is 12...

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Abstract

The invention relates to a method and equipment for producing acetal through catalytic distillation. Through the application of a catalytic rectifying tower and an ethanol recycle tower, the method comprises the following specific steps of: (1) feeding a raw material, namely ethanol into a lower feeding hole of the catalytic rectifying tower after passing through a metering pump and a preheater, feeding a raw material, namely an acetaldehyde solution into an upper feeding hole of the catalytic rectifying tower after passing through the metering pump, wherein aldolization happens between the raw material acetaldehyde and ethanol at the middle part of the catalytic rectifying tower, and carrying out vapor-liquid mass transferring; (2) condensing mixed vapor of acetal and ethanol obtained at the top of the catalytic rectifying tower through a condenser, wherein a part of the condensed mixed vapor flows back to the top of the catalytic rectifying tower through a reflux pump, and collecting the remaining mixed vapor out as product; and (3) pumping waste water discharged out at the bottom of the catalytic rectifying tower into the middle part of the ethanol recovery tower to carry out distillation and separation, and condensing azeotrope steam of ethanol and water obtained at the top of the tower through the condenser, wherein a part of the condensed azeotrope steam flows back to the top of the ethanol recovery tower by depending on gravity, and the remaining condensed azeotrope steam flows back to the ethanol inlet of the catalytic rectifying tower for cyclic utilization. The device has the advantages of being high in yield, small in circulating amount, low in energy consumption and the like.

Description

technical field [0001] The invention belongs to the catalytic rectification technology in the field of chemical industry, and relates to a method for producing acetal by catalytic rectification using ethanol and acetaldehyde as raw materials and production equipment thereof. Background technique [0002] Acetal, also known as diethoxyethane, molecular formula: C 6 h 14 o 2 , molecular weight: 118, CAS number: 105-57-7, colorless transparent liquid, melting point -100°C, boiling point 102.7°C; miscible with alcohol, ether, etc., soluble in heptane, methylcyclohexane and ethyl acetate etc., its solubility is similar to that of ether; its solubility in water is 5% at 25°C, and it can form an azeotrope with water, with an azeotropic point of 82.66°C, and its azeotropic composition: 85.5% of acetal and 14.5% of water; Boiler, azeotropic point 78 ℃, azeotropic composition: acetal 76%, ethanol 24%. Main application: used in food additives, fuel additives, dye intermediates, cos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C43/303C07C41/56
CPCY02P20/10
Inventor 杨金杯余美琼
Owner FUQING BRANCH OF FUJIAN NORMAL UNIV
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