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Ethyl acetate energy-saving production system and corresponding energy-saving production process

A technology of ethyl acetate and production process, which is applied in the field of organic compound preparation, can solve the problems that the moisture index of finished ethyl acetate cannot be directly achieved, the production capacity of the esterification tower is reduced, and the ability of reflux to carry water is poor, so as to achieve simple structure and reduce reflux Ratio, the effect of reducing the gas-liquid phase load

Inactive Publication Date: 2017-01-11
河北维尔多硒食品有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The water, ethanol and ethyl acetate produced by the reaction can form ternary and binary azeotropes respectively, and the amount of water contained in the raw materials and the amount of water generated by the reaction is far greater than the amount of water that can be brought by the azeotropy of ester water when producing ethyl acetate. The amount of water to be removed requires the reflux of the organic phase at the top of the esterification tower to carry water. Usually, the reflux ratio of the esterification tower is about 3-3.5, but the water content in the organic phase is relatively high, so the ability of reflux to carry water is poor, and the production capacity of the esterification tower is reduced. The same reason causes the water content in the crude ester that enters the delightening tower to be relatively high, for improving the yield of ethyl acetate, when guaranteeing that the tower still is extracted and does not contain water and ethanol, the reflux ratio of the tower top is usually larger In addition, in order to reduce the consumption of ethanol in the traditional process, the head ester extracted from the top of the light removal tower returns to the esterification tank to continue to participate in the reaction. Because the head ester contains water, a part of the water is circulated in the esterification and light removal process, making the ester The gas-liquid phase load of the chemical tower and light removal tower is relatively large, the energy consumption of the product is high, and the production capacity is limited
[0004] The Chinese invention patent with the notification number CN102030639B discloses "a new process for energy-saving production of ethyl acetate", which adopts membrane separation method for dehydration, and the water content of crude ester after dehydration is reduced to 0.95%. This method can reduce the water content to a certain extent. Circulation in the esterification and light removal section reduces the load on the two towers. However, the dehydrated ethyl acetate cannot directly reach the moisture index of the finished ethyl acetate, and some water is still in the light removal tower and the esterification tower. Intercycle

Method used

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  • Ethyl acetate energy-saving production system and corresponding energy-saving production process
  • Ethyl acetate energy-saving production system and corresponding energy-saving production process
  • Ethyl acetate energy-saving production system and corresponding energy-saving production process

Examples

Experimental program
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Embodiment 1

[0035] Example 1 A kind of energy-saving production system of ethyl acetate

[0036] The energy-saving production system of ethyl acetate of the present embodiment is as figure 1 As shown, it includes an esterification tank 1 for carrying out the esterification reaction, and an esterification tower 2 connected to the esterification tank 1 through a pipeline.

[0037] The esterification kettle 1 is provided with a discharge inlet and a feed inlet. The esterification tower 2 is provided with a feed inlet, a return inlet and a steam outlet.

[0038] The vapor outlet of the esterification tower 2 is connected to the esterification buffer tank 3 and the molecular sieve tower feed pump 4 through pipelines in sequence.

[0039] This embodiment also includes a molecular sieve dehydration device composed of a preheater 5 , an evaporator 6 , a superheater 7 , a first molecular sieve bed 8 , a condenser 9 and a regeneration condenser 12 .

[0040] The molecular sieve feed pump 4 ...

Embodiment 2

[0054] Example 2 A kind of energy-saving production process of ethyl acetate

[0055] The energy-saving production process of ethyl acetate provided in this example includes esterification process, molecular sieve dehydration process, light removal process, refining process and recovery process carried out in sequence. This technology relies on the energy-saving production system of the ethyl acetate provided in the embodiment 1 to realize, and technological process is as follows:

[0056] After the raw materials are heated and catalyzed in the esterification kettle 1, ethyl acetate and water are generated. Ethyl acetate, water and unreacted ethanol can form ethyl acetate-water-ethanol ternary azeotrope or ethyl acetate-water, Water-ethanol, ethyl acetate-ethanol binary azeotrope, the mixture A extracted from the top of the tower is sent to the esterification tower 2 for rectification and separation; in order to improve the moisture content of the gas phase extracted from...

Embodiment 3-7

[0060] Example 3-7 Energy-saving Production Process of Ethyl Acetate

[0061] Embodiment 3-7 is respectively a kind of energy-saving production technology of ethyl acetate, and the technological parameter of technological process and relevant operation is identical with embodiment 2, and the type of molecular sieve is 3a, and difference is only in esterification tower pressure and molecular sieve The corresponding control parameters in the dehydration section are different, see Table 1 for details.

[0062]

[0063] In Example 3-7, after the crude esters generated are dehydrated in the molecular sieve section, the water content of the crude esters is ≤0.05%, and the ethanol content of the organic phase extracted from the top of the light removal tower is about 25%, and the corresponding ethyl acetate they provide The energy-saving production process of esters has the characteristics of simple process flow and easy control. The dehydrated ethyl acetate directly reaches ...

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Abstract

The invention discloses an energy-saving production system of ethyl acetate. The energy-saving production system of the ethyl acetate comprises an esterification reactor, an esterification tower, an esterification buffering tank, a molecular sieve tower feeding pump, a first preheater, an evaporator, a superheater, a molecular sieve bed, a second preheater, an esterification return tank, a light component removal tower feeding pump and a light component removal tower. The energy-saving production system is simple in structure, easy to operate, low in production cost, easy to repair and low in energy consumption. The invention also provides an energy-saving production technology of the ethyl acetate, a molecular sieve water removal section is added between an esterification section and a light component removal section, the technological process is simple, the water content of raw ester after water removal is smaller than or equal to 0.05%, gas-phase and liquid-phase loads of the esterification tower and the light component removal tower are reduced, the capacity of the ethyl acetate is improved, and energy consumption is reduced. The energy-saving production system of the ethyl acetate is suitable for industrially producing the ethyl acetate in batches, and is also suitable for producing acetic acid isopropyl esters and the like.

Description

technical field [0001] The invention belongs to the field of organic compound preparation and relates to the production of ethyl acetate, in particular to an energy-saving system for ethyl acetate and a corresponding production process. Background technique [0002] Ethyl acetate is an important organic chemical raw material, which has important applications in the fields of medicine, fragrance, paint, coating, printing, printing ink and food. The production method of ethyl acetate is generally obtained through the reaction of acetic acid and ethanol under the catalysis of concentrated sulfuric acid, dehydration, light removal, deacidification, and refining. Since the reaction between acetic acid and ethanol is reversible, from an economic point of view, to obtain ethyl acetate product needs to constantly remove the reaction product in order to facilitate the positive reaction. [0003] At present, in order to ensure the continuous progress of the esterification reaction, i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/14C07C67/08C07C67/48C07C67/56
CPCC07C67/08C07C67/48C07C67/56C07C69/14Y02P20/10
Inventor 扈士海张拴力李银江周俊芬王素新张桂彦张志华
Owner 河北维尔多硒食品有限公司
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