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Method for reducing acidity of acetate

A technology of acetate and acetic acid, which is applied in the field of acetate synthesis technology, can solve the problems of high cost, avoid costs, solve serious corrosion problems, and have simple processing requirements

Active Publication Date: 2015-03-25
NANTONG BAICHUAN NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If it is necessary to use expensive corrosion-resistant materials to make equipment for reaction or refining systems, the cost is very high

Method used

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  • Method for reducing acidity of acetate

Examples

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Effect test

Embodiment 1

[0024] A method for reducing the acidity of n-butyl acetate, mainly using acetic acid and n-butanol as raw materials, continuously pumping them into the acetic acid preheater 1 and n-butanol preheater 2 respectively, and feeding them into the esterification kettle 5 after preheating and mixing , using concentrated sulfuric acid as a catalyst, carry out esterification reaction at a temperature of 120±5°C in a loop formed by esterification kettle 5 and reboiler 6, to prepare n-butyl acetate;

[0025] The n-butyl acetate formed by the esterification reaction in the loop forms an azeotrope with water and n-butanol. The boiling point of the azeotrope is 90.7°C. Entering the lower part of the acid trap 3 lined with polytetrafluoroethylene, the gaseous phase stream carries part of acetic acid and a small amount of sulfuric acid when entering the acid trap 3 .

[0026] The gaseous phase flows upward through the ceramic packing layer 4 in the acid trap 3 lined with polytetrafluoroethyl...

Embodiment 2

[0034] A method for reducing the acidity of ethyl acetate, mainly using acetic acid and alcohol (the main component is ethanol) as raw materials, continuously pumping them into the acetic acid preheater 1 and the ethanol preheater 2 respectively, and feeding the ester after preheating and mixing Reactor 5, using concentrated sulfuric acid as a catalyst, carries out esterification reaction in a loop formed by esterification kettle 5 and reboiler 6 to prepare ethyl acetate;

[0035] Ethyl acetate formed by the esterification reaction in the loop forms an azeotrope with water and ethanol. The boiling point of the azeotrope is 70.2°C. It is evaporated in the form of gas phase and enters the inner lining through the gas phase outlet at the top of the esterification kettle 5. At the lower part of the acid trap 3 of polytetrafluoroethylene, the gaseous phase flow carries part of acetic acid and a small amount of sulfuric acid when it enters the acid trap 3 .

[0036] The gas phase st...

Embodiment 3

[0047] A method for reducing the acidity of n-propyl acetate, mainly using acetic acid and n-propanol as raw materials, continuously pumping them into the acetic acid preheater 1 and n-propanol preheater 2 respectively, and passing them into the esterification kettle 5 after preheating and mixing , using concentrated sulfuric acid as a catalyst, carry out esterification reaction in a loop formed by esterification kettle 5 and reboiler 6, to prepare n-propyl acetate;

[0048] The n-propyl acetate formed by the esterification reaction in the loop forms an azeotrope with water and n-propanol. The boiling point of the azeotrope is 82.2°C. Entering the lower part of the acid trap 3 lined with polytetrafluoroethylene, the gaseous phase stream carries part of acetic acid and a small amount of sulfuric acid when entering the acid trap 3 .

[0049] The gas phase stream passes upwards through the ceramic packing layer 4 in the acid trap 3 lined with polytetrafluoroethylene, and carries ...

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Abstract

The invention relates to a method for reducing the acidity of acetate. The method comprises the following steps: carrying out an esterification reaction of raw materials comprising acetic acid and lower fatty alcohol in a loop composed of an esterification kettle and a reboiler by treating concentrated sulfuric acid as a catalyst; allowing a gas phase material steamed after the esterification reaction to go through an acid trap having a polytetrafluoroethylene inner liner, carrying out mass transfer exchange of the obtained gas phase material and a tower bottom liquid from the bottom of an esterification tower in a ceramic filler layer for washing off most acetic acid and most sulfuric acid entrained by a gas phase material flow; connecting different gas phase material flows discharged from the upper portion of the acid trap to feeding ports at different positions of the esterification tower through the valve combination, and carrying out separation and subsequent refining in the esterification tower to reduce the acidity of the acetate. The acetate obtained through adopting the method accords with product acidity requirements of corresponding product standards.

Description

technical field [0001] The invention relates to an acetate synthesis process, in particular to a method for reducing the acidity of acetate. Background technique [0002] Today's application fields have higher and higher requirements for fine chemical products. In the field of coatings, inks and adhesives, the acidity of acetate products produced by esterification of lower aliphatic alcohols (less than or equal to 10 carbon atoms) and acetic acid is very high. There are very strict requirements. For example, the national standard of GB / T 3728-2007 "Ethyl Acetate for Industrial Use" requires the acidity of ethyl acetate to be ≤0.004% for superior products and ≤0.005% for qualified products. [0003] In fact, in the field of acetate production, it is very difficult to control the acidity in terms of acetic acid, because acetic acid is one of the raw materials for the production of acetate, there is a large amount of acetic acid in the esterification kettle, and acetic acid i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/08C07C67/48C07C69/14
Inventor 郑铁江李勋波薛建军孙百亚汤洪良陆乐
Owner NANTONG BAICHUAN NEW MATERIAL CO LTD
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