Three-column two-membrane coupled reinforced refining method for fuel ethanol

A technology for fuel ethanol and ethanol vapor, which is applied in chemical instruments and methods, preparation of hydroxyl compounds, preparation of organic compounds, etc., can solve the problems of poor compatibility of materials and heat in the rectification section and purification section, and achieve high-efficiency and low-energy consumption preparation , save steam, simple operation effect

Active Publication Date: 2019-11-22
CNOOC TIANJIN CHEM RES & DESIGN INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is: in the existing bio-mash preparation fuel ethanol process technology, there is a problem that the material and heat in the rectification section and the purification section are not high, and the overall energy consumption of the process is further greatly reduced and optimized. A new combined rectification tower rectification and membrane separation technology integrated enhanced refined fuel ethan

Method used

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  • Three-column two-membrane coupled reinforced refining method for fuel ethanol
  • Three-column two-membrane coupled reinforced refining method for fuel ethanol
  • Three-column two-membrane coupled reinforced refining method for fuel ethanol

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Effect test

Embodiment 1

[0042] The process flow diagram is figure 1 Said, the raw material of the fermentation mash is corn, and the temperature is 29.9°C. Fixed vacuum distillation column 1 and pressurized distillation column 2 have a plate number of 57, fixed pressurized distillation column 3 has a plate number of 61, and the feed positions of columns 1, 2 and 3 are at 35, 35 and 45 plates respectively. (counting from the tower kettle). The reflux ratio of the fixed column 1 is 1.2, the reflux ratio of the fixed pressure rectification column 2 is 1.8, and the reflux ratio of the fixed pressure rectification column 3 is 1.4. The ethanol volume concentration of the fermented mash is 5.4%. After feeding, the operating conditions of each tower in the combined tower, the amount of steam consumed by the system per unit of fuel ethanol, the energy saving situation compared with the traditional process, and the energy saving situation relative to the combined tower molecular sieve integrated process As s...

Embodiment 2

[0044] The process flow diagram is figure 1 Said, the raw material of the fermentation mash is corn, and the temperature is 29.9°C. Fixed vacuum distillation column 1 and pressurized distillation column 2 have a plate number of 57, fixed pressurized distillation column 3 has a plate number of 61, and the feed positions of columns 1, 2 and 3 are at 35, 35 and 45 plates respectively. (counting from the tower kettle). The reflux ratio of the fixed column 1 is 1.2, the reflux ratio of the fixed pressure rectification column 2 is 1.8, and the reflux ratio of the fixed pressure rectification column 3 is 1.4. The ethanol volume concentration of the fermented mash is 11.8%. After feeding, the operating conditions of each tower in the combined tower, the amount of steam consumed by the system per unit of fuel ethanol, the energy saving situation compared with the traditional process, and the energy saving situation relative to the molecular sieve integrated process of the combined tow...

Embodiment 3

[0046] The process flow diagram is figure 1 Said, the raw material of the fermentation mash is corn, and the temperature is 29.9°C. Fixed vacuum distillation column 1 and pressurized distillation column 2 have a plate number of 57, fixed pressurized distillation column 3 has a plate number of 61, and the feed positions of columns 1, 2 and 3 are at 35, 35 and 45 plates respectively. (counting from the tower kettle). The reflux ratio of the fixed vacuum distillation column 1 is 1.2, the reflux ratio of the fixed vacuum distillation column 2 is 1.8, and the reflux ratio of the fixed vacuum distillation column 3 is 1.4. The ethanol volume concentration of the fermented mash is 13.6%. After feeding, the operating conditions of each tower in the combined tower, the amount of steam consumed by the system per unit of fuel ethanol, the energy saving situation compared with the traditional process, and the energy saving situation relative to the combined tower molecular sieve integrate...

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Abstract

The invention discloses a three-column two-membrane coupled reinforced refining method for fuel ethanol. In the method, a rectification-purification process system includes a three-column rectification section formed by connecting a decompression distillation column and two pressurized coarse distillation columns which adopt a mash parallel feeding manner, and a purification section includes a membrane separation device. Materials of the rectification section and the purification section are highly matched with a heat system to reduce steam consumption for a unit product; through combination of vapor permeation and membrane separation, the concentration requirement of fed ethanol is reduced, the number of column trays of the pressurized coarse distillation columns is reduced, and the reflux ratio is reduced, so that biomass fermented mash is rectified and purified to prepare high-purity ethanol meeting the requirement of fuel ethanol, and the production purposes of environmental protection, energy conservation and high efficiency are achieved. The method disclosed by the invention has the advantages of greatly saving steam consumption, being high in one-time discharging quality, high in system automation degree, small in occupied area of the device, convenient to maintain equipment, reliable and durable in membrane consumable material, high in resource utilization rate and thelike.

Description

technical field [0001] The invention relates to a method for strengthening and refining fuel ethanol by coupling of three towers and two membranes. Background technique [0002] The development and utilization of fossil energy faces serious problems of environmental pollution and resource depletion. When ethanol is burned, it has the advantages of moderate carbon and oxygen composition, high octane number, and no overload of greenhouse gases and pollutants after combustion. It has been used as a gasoline additive and has a huge market. Fuel ethanol is anhydrous ethanol with a volume concentration of more than 99.5%. When used as a fuel improver, it can increase oxygen and support combustion, and achieve the purpose of energy saving and environmental protection. At the same time, biofuel ethanol is renewable, so the process of preparing fuel ethanol by biological route is widely used in the ethanol industry at home and abroad. Under the background of increasing national req...

Claims

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Application Information

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IPC IPC(8): C07C29/76C07C29/78C07C29/80C07C31/08
CPCC07C29/76C07C29/78C07C29/80C07C31/08Y02P20/50
Inventor 周立坤于海斌潘月秋吴巍高卓盛春光
Owner CNOOC TIANJIN CHEM RES & DESIGN INST
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