Method and device for molecular sieve compound rectifying and refining ethanol product from biobutanol apparatus

A molecular sieve and ethanol technology, used in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of excessive isopropanol and water content, and achieve the goal of improving product grades, increasing market competitiveness and increasing profits. Effect

Inactive Publication Date: 2012-02-15
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can solve the problem that the content of isopropanol and water in the ethanol product exceeds the standard in the total solvent production

Method used

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  • Method and device for molecular sieve compound rectifying and refining ethanol product from biobutanol apparatus
  • Method and device for molecular sieve compound rectifying and refining ethanol product from biobutanol apparatus
  • Method and device for molecular sieve compound rectifying and refining ethanol product from biobutanol apparatus

Examples

Experimental program
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Effect test

Embodiment 1

[0027] From the ethanol material extracted from the side line of the ethanol tower, wherein the ethanol content is 90%, the isopropanol content is 5%, and the water content is 5%, according to figure 2 The method and apparatus shown carry out the production of absolute ethanol. The material is a gas phase product extracted from the side line of the ethanol tower, with a flow rate of 1000kg / hr. After being overheated by the ethanol superheater to 160°C, it is continuously sent to the molecular sieve adsorption bed for adsorption and dehydration. The adsorbent used in the molecular sieve adsorption bed is A-type molecular sieve. The operating pressure of the molecular sieve adsorption bed is 0.5MPa, and the operation time of each adsorption bed is 30min, after which it is transferred to the regeneration stage. There are two molecular sieve adsorption dehydration beds, one for adsorption and dehydration, and the other for regeneration. The operating pressure in the regeneration...

Embodiment 2

[0029] From the ethanol material extracted from the side line of the ethanol tower, wherein the ethanol content is 85%, the isopropanol content is 10%, and the water content is 5%, according to figure 2 The method and apparatus shown carry out the production of absolute ethanol. Rectification, dehydration steps are basically the same as in Example 1, the difference is as follows: the product extracted from the side line of the ethanol tower is a liquid phase, and then enters the molecular sieve adsorption bed for dehydration after passing through the ethanol evaporator into steam, and the adsorbent used in the molecular sieve adsorption bed For X-type molecular sieve. After refining in the ethanol refining tower, the mass fraction of the ethanol product reaches 99.8%, reaching the national standard GB / T 678-2002 for absolute ethanol products.

Embodiment 3

[0031] From the ethanol material extracted from the side line of the ethanol tower, wherein the ethanol content is 82%, the isopropanol content is 3%, and the water content is 15%, according to figure 2 The method and apparatus shown carry out the production of absolute ethanol. Rectifying, dehydration step is substantially the same as embodiment 1, and its difference is as described below. There are 4 molecular sieve adsorption beds, the adsorbent used is Y-type molecular sieve, and the operating pressures of adsorption and desorption are 0.8MPa and 0.03MPa respectively. In one operation cycle, three adsorption beds are guaranteed to perform adsorption operation at the same time, and one is to perform desorption operation. The dehydrated ethanol material is then refined in an ethanol refining tower, and the mass fraction of the obtained ethanol product reaches 99.8%, which meets the national standard GB / T 678-2002 for absolute ethanol products.

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Abstract

The invention relates to a method and a device for refining bioethanol, and especially relates to a method for refining ethanol in the process of general solvent production by microbial fermentation. The invention is characterized in that a compound technology of molecular sieve adsorption dehydration and rectification is employed for removing isopropanol and water in ethanol material. The process comprises the following steps: the ethanol material collected from an ethanol tower is entered into a molecular sieve adsorption bed for dehydrating, the dehydrated ethanol material is entered into an ethanol refining tower for separating and refining; an ethanol product can be collected from the top of the ethanol refining tower, and isopropanol-rich fraction is collected from a tower kettle. The method of the invention can solve the problem that the isopropanol and water content in ethanol product exceeds the standard during the biobutanol production. Accordingly, the method and device of the invention are capable of increasing the profit of the enterprises which produce the general solvent as well as raising the market competitiveness of the biobutanol product.

Description

technical field [0001] The invention relates to a method and equipment for refining bioethanol, in particular to refining ethanol in the process of producing total solvent by a biological fermentation method. Isopropanol and water in crude ethanol materials are removed by molecular sieve adsorption dehydration and rectification compound process. Background technique [0002] With the increasingly prominent energy and environmental issues, it is the future development direction to use biomass as raw material and adopt biotechnology to produce chemical products. The butanol, acetone, and ethanol products produced jointly by fermentation are collectively referred to as total solvents. The production of the total solvent uses corn, wheat, sorghum, sweet potato and other starch, sugar cane, molasses, Jerusalem artichoke and other cellulose, or crop straw, forestry waste and other cellulose as raw materials, and the finished product is obtained through fermentation substrate prep...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C31/08C07C29/80C07C29/76
Inventor 张敏华董秀芹耿中峰钱胜华陶敏莉张志强
Owner TIANJIN UNIV
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