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A kind of ethyl acetate energy-saving production process

A technology of ethyl acetate and production process, which is applied in the field of energy-saving production process of ethyl acetate, can solve the problems of high water content, many side reactions, waste of finished product output, etc., and achieve mild esterification reaction, reduced dosage, and few side reactions Effect

Active Publication Date: 2019-01-18
JINJIANG TAIXING CHEM IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 1. Concentrated sulfuric acid is used as a catalyst. Although the reaction activity is fast, it has the disadvantages of serious equipment corrosion and many side reactions;
[0006] 2. The reaction product at the top of the esterification tower is first condensed and cooled, then phase-separated at room temperature to separate the water phase, and part of the organic phase is refluxed into the esterification tower. In this process, the materials need to be phase-separated at room temperature, which wastes the original The heat of gas phase reaction products;
[0007] 3. The water content in the refluxed organic phase is relatively high, and the ethyl acetate of the finished product is often carried with water, which wastes the output of the finished product
[0008] Chinese patent authorization CN 102030639 B discloses "A New Process for Energy-Saving Production of Ethyl Acetate", in which the reaction product at the top of the esterification tower is phase-separated at room temperature, and then the organic phase is re-entered into the membrane separation section for dehydration. This process does not solve the original gas-phase reaction The problem of product heat waste, energy saving is not obvious

Method used

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  • A kind of ethyl acetate energy-saving production process
  • A kind of ethyl acetate energy-saving production process
  • A kind of ethyl acetate energy-saving production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Taking a set of 50,000 t / a ethyl acetate test equipment as an example, the catalysts of the tubular reactor and the esterification kettle are all made of strong acidic macroporous cation exchange resin Amberlyst-15, and the membrane components of the membrane separation unit are made of a zeolite Molecular sieve membrane; the raw materials acetic acid and ethanol enter the tubular reactor 1 with a molar ratio of 1:1. 2. There is excess ethanol in the esterification kettle 2, the ethanol content is about 60wt.%, the internal reaction temperature of the esterification kettle is 75°C, and the azeotrope steamed from the top of the esterification kettle goes through the demister 3 to remove solid impurities and foam and then enters the membrane Separation unit 4, the entry temperature is 72°C, the vacuum pressure on the permeation side of membrane separation unit 4 is 300pa absolute pressure, the water phase after membrane treatment enters the recovery tower 6, and the water ...

Embodiment 2

[0023] Taking a 50,000 t / a ethyl acetate large-scale test plant as an example, the tubular reactor and the esterification kettle use the strong acidic macroporous cation exchange resin Nafion NR50 as the catalyst, the membrane module uses a zeolite molecular sieve membrane, and the raw materials are acetic acid and ethanol Enter the tube reactor 1 for pre-reaction with a molar ratio of 1:1. The reaction temperature in the tube reactor is 80°C. About 50wt.%, the reaction temperature of the esterification tank 2 is 80 ° C, the azeotrope steamed from the top of the esterification tank passes through the demister 3 to remove solid impurities and foam, and then enters the membrane separation unit 4, and the temperature entering the membrane separation unit 4 is 75°C, the vacuum pressure on the permeation side of the membrane is 350pa absolute pressure, the water phase after membrane treatment enters the recovery tower 6, and the water content of the vapor phase distillate after memb...

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PUM

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Abstract

The invention relates to an energy-saving production process for ethyl acetate, belonging to the technical field of ethyl acetate production. Compared with the prior art, an additional tubular reactor is employed and an esterification column is discarded in the invention. The energy-saving production process has the advantages that an esterification reaction is mild, few side reactions occur and a small amount dangerous waste is produced; an azeotropic product does not need condensation and cooling and reflux and refining of organic matters do not need re-heating, so the usage amount of steam and circulating water is greatly reduced; and water content of crude ethyl acetate steam obtained after membrane separation is no more than 1 wt% and a part of the crude ethyl acetate steam returns to an esterification kettle to carry water, so supplementation of finished ethyl acetate for water carrying is not needed.

Description

technical field [0001] The invention belongs to the technical field of ethyl acetate production and relates to an energy-saving production process for ethyl acetate. Background technique [0002] Ethyl acetate is an important organic chemical raw material, which can be used to manufacture acetamide, acetoacetate, etc. As an industrial solvent, it can be used in paint coatings, adhesives, ethyl cellulose, artificial leather, linoleum colorants, artificial fibers, etc. In products; as a binder, used in the production of printing inks and artificial pearls; as an extractant, used in the production of medicines, organic acids and other products; and in flavors and fragrances, medicines, advanced inks, collodion, nitrocellulose, Widely used in industries such as dyes. [0003] The traditional ethyl acetate industrial production method uses concentrated sulfuric acid as a catalyst, and the raw materials ethanol and acetic acid react in an esterification kettle. The acetic acid in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/08C07C67/48C07C67/54C07C69/14
CPCC07C67/08C07C67/48C07C67/54C07C69/14Y02P20/10
Inventor 佟刚冯佩洪李永为
Owner JINJIANG TAIXING CHEM IND CO LTD
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