Multiple adsorption tower alternate internal recycle method for producing anhydrous alcohol

An anhydrous ethanol and adsorption tower technology, applied in chemical instruments and methods, methods for reacting gas medium with gas medium, total evaporation, etc., can solve problems such as the influence of adsorbent life, large cooling water consumption, and large instantaneous heat , to achieve the effects of reducing the area of ​​the heat exchanger, high dehydration depth, and gradual decompression analysis

Inactive Publication Date: 2006-02-15
SICHUAN TECHAIRS
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Problems solved by technology

However, the feeding method of the current method is lower feeding, which forms the agitation of the gas and produces the displacement of the adsorption bed. The product often entrains the adsorbent, which affects the life of the adsorbent; at the same time, in the process of producing absolute ethanol, because There are a large number of vaporization and cooling processes, so the cooling water consumption is very large; and due to the centralized analysis, the cooling water and heat exchange area required for instantaneous cooling of the analysis steam are very large, resulting in large equipment load, large energy consumption, and large equipment investment. High operating costs; during the desorption process of the adsorption tower, the valve is directly opened and closed, resulting in the momentum of the gas, which is easy to cause the pulverization of the adsorbent, and the instantaneous heat is large, and the heat exchange area required per unit time is large

Method used

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  • Multiple adsorption tower alternate internal recycle method for producing anhydrous alcohol

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Refer to attached figure 1 As shown, the ethanol aqueous solution raw material with a concentration weight ratio of 70% enters the vaporizer 2 after exchanging heat with the product in the heat exchanger 1, and is vaporized by steam heating in the vaporizer 2, and is superheated to 80°C, and the superheated ethanol aqueous solution raw material The steam enters the adsorption tower A through the valve 11 from top to bottom, and at this time the valves 12, 13, 14, and 15 are closed; when the adsorption tower A absorbs for 250 seconds, the raw material steam of the superheated ethanol aqueous solution enters the adsorption tower B through the valve 21 from top to bottom Now, valves 22, 23, 24, and 25 are closed, the pressure of adsorption tower A and B is set to 0.1Mpa, and the adsorption time is set to 500 seconds; ethanol vapor flows out through valves 15, 25 at the bottom of the adsorption tower, and ethanol vapor after dehydration passes through the Heater 1 heats the...

Embodiment 2

[0028] Refer to attached figure 1 As shown, the ethanol aqueous solution raw material with a concentration weight ratio of 99% enters the gasifier after exchanging heat with the product through a heat exchanger, is heated and vaporized by the vaporizer steam, and is superheated to 220°C. And down enters adsorption tower A through valve 11, now valve 12,13,14,15 closes; Valves 22, 23, 24, and 25 are closed, the pressure of adsorption towers A and B is set to 2.5Mpa, and the adsorption time is set to 50 seconds; ethanol vapor flows out through valves 15 and 25 at the lower part of the adsorption tower, and ethanol vapor after dehydration passes through heat exchanger 1 Heating the ethanol raw material, cooling by the product cooler 3 after cooling, sampling and analysis to obtain anhydrous ethanol with a content of 99.99%, and entering the product storage tank 8 through the valve 51; if the ethanol content does not meet the requirements, enter the raw material ethanol storage ta...

Embodiment 3

[0034] Refer to attached figure 1 As shown, the ethanol aqueous solution raw material with a concentration weight ratio of 85% enters the gasifier after exchanging heat with the product through a heat exchanger, is heated and vaporized by the steam in the gasifier, and is superheated to 150°C. And down enters adsorption tower A through valve 11, now valve 12,13,14,15 closes; Valves 22, 23, 24, and 25 are closed, the pressure of adsorption towers A and B is set to 1.0Mpa, and the adsorption time is set to 250 seconds; the ethanol vapor flows out through valves 15 and 25 at the lower part of the adsorption tower, and the dehydrated ethanol vapor passes through heat exchanger 1 Heating the ethanol raw material, cooling by the product cooler 3 after cooling, sampling and analysis to obtain anhydrous ethanol with a content of 99.7%, and entering the product storage tank 8 through the valve 51; if the ethanol content does not meet the requirements, enter the raw material ethanol sto...

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Abstract

Disclosed is a multiple adsorption tower alternate internal recycle method for producing anhydrous alcohol, which comprises the steps of heating, adsorbing, internal recycling, vacuum evacuating, flushing and resolving, the process has the advantages of extended adsorbent lifetime, reduced heat exchanger area, lowered cooling-water consumption, deep de-watering depth, and no pollution.

Description

technical field [0001] The invention relates to a method for producing anhydrous ethanol, in particular to a method for producing anhydrous ethanol with a multi-adsorption tower staggered internal circulation. Background technique [0002] As an important chemical raw material and solvent, absolute ethanol occupies an inestimable position in the national economy. With the rapid growth of market demand and the continuous improvement of product quality requirements, the method of producing absolute ethanol is also continuously improved and developed. The preparation methods of absolute ethanol include the earliest traditional calcium oxide method, ion exchange method, benzene azeotropic distillation method, pentane azeotropic method, extractive distillation method, molecular sieve method, etc. Although azeotropic distillation and extractive distillation can obtain relatively high content of absolute ethanol, these methods inevitably bring in a small amount of organic dissolve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/08C07C29/78C12H6/04
CPCC07C29/76Y10S95/902Y10S203/14C07C31/08
Inventor 钟娅玲钟雨明李园华李丽川
Owner SICHUAN TECHAIRS
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