Energy-saving production system of ethyl acetate and corresponding energy-saving production technology

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...

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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

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