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Near azeotropic ethanol dewatering process

A near-azeotropic ethanol technology, which is applied in the field of near-azeotropic ethanol water removal process, can solve the problems of product performance impact, non-competitiveness, high alcohol price, etc., and achieve reduced energy consumption, large-scale production of high-efficiency ethanol gasoline, and simplified The effect of the process

Inactive Publication Date: 2008-05-07
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the above-mentioned process can obtain higher concentration of ethanol, the disadvantage is that the energy consumption is large, the process is long, and the mixing of a small amount of azeotropic agent or extractant brings considerable additional equipment and energy investment for the subsequent separation process. also affect product performance
Generally speaking, the relatively high cost of food in our country makes the price of fermented alcohol relatively high. In addition to the production cost of rectification, the price of fuel ethanol is not obviously competitive with ordinary gasoline at present.

Method used

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  • Near azeotropic ethanol dewatering process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] a. first fill the columnar solid acid S-54 resin catalyst filler in the reaction section C of the reactive distillation tower 6, add the ethanol-water mixture feed liquid of 700ml 85wt% in the tower still A;

[0032] b. Then the top of the tower is connected to N 2 Pressurize the whole tower, add 500ml of C4 fraction from the lower part of the reaction section, heat the tower kettle 6 and gradually adjust the pressure to 1.5MPa, and perform total reflux operation;

[0033] c. After half an hour of total reflux operation until the whole tower is basically stable, set the reflux ratio to 5 and start feeding. When feeding, the ethanol-water mixture is fed into the reactive distillation column 6 from the upper end of the reaction section C after being preheated by the metering plunger pump of the storage tank 1. The metering plunger pump is fed into the reactive distillation column 6 from the lower end of the reaction section C after being preheated, and the feed flow rate...

Embodiment 2

[0039] a. first fill the columnar solid acid S-54 resin catalyst filler in the reaction section C of the reactive distillation tower 6, add the ethanol-water mixture feed liquid of 700ml 90wt% in the tower still A;

[0040] b. Then the top of the tower is connected to N 2 Pressurize the whole tower, and add 500ml of C4 fraction, then heat the tower kettle A and gradually adjust the pressure to 2.0MPa, and carry out total reflux operation;

[0041] c. After half an hour of total reflux operation until the whole tower is basically stable, set the reflux ratio to 10 and start feeding. When feeding, the ethanol-water mixture is fed into the reactive distillation column 7 from the upper end of the reaction section C after being preheated by the metering plunger pump of the storage tank 1. The metering plunger pump is fed into the reactive distillation column 6 from the lower end of the reaction section C after being preheated, and the feed flow rate is 263.0ml / h;

[0042] d. with...

Embodiment 3

[0046] a. with step a of embodiment 2;

[0047] B. with the step b of embodiment 1;

[0048] c. After half an hour of total reflux operation until the whole tower is basically stable, set the reflux ratio to 5 and start feeding. When feeding, the ethanol-water mixture is fed into the reactive distillation column 6 from the upper end of the reaction section C after being preheated by the metering plunger pump of the storage tank 1. The metering plunger pump is fed into the reactive distillation column 7 from the lower end of the reaction section C after preheating, and the feed flow rate is 263.0ml / h.

[0049] d. with the step d of embodiment 1;

[0050] e. After the operation of the tower reaches a steady state, the temperature inside the tower kettle A is 130°C, and the temperature at the tower head is 90°C. After continuous operation, the prepared high-performance alcohol-ether mixed fuel is collected in the kettle liquid storage tank 5.

[0051] Analyzed by gas chromatog...

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Abstract

The near azeotropic ethanol mixture dewatering process includes the following steps: filling the reaction section of reacting rectification tower with cylindrical solid acid catalyst stuffing and feeding near azeotropic ethanol-water mixture; introducing N2 into the tower for pressurizing, adding C4 fraction, heating and regulating pressure for total reflux operation; setting reflux ratio and adding ethanol-water mixture and C4 fraction based on the set material ratio; condensing the tower top product, returning partial tower top product to the tower while collecting the rest in the tower top storage tank; and collecting the tower bottom product through the bottom condenser with the bottom storage tank as the anhydrous alcohol-ether mixture fuel.

Description

technical field [0001] The invention relates to an ethanol water removal method, in particular to a near-azeotropic ethanol water removal process. Background technique [0002] Ethanol gasoline (also known as gasoline alcohol) is a new type of environmentally friendly mixed fuel formed by adding a certain proportion of denatured fuel ethanol to gasoline. Because ethanol itself has a high octane number, good compatibility and oxygen-containing combustion-supporting characteristics, after using ethanol gasoline, the fuel consumption and power performance of the car will not change much, but the average carbon monoxide emission will be reduced by more than 60%. The emission of chemical compounds has dropped by more than 10%. At the same time, ethanol can be produced by means of biological fermentation, which is a kind of renewable energy. Therefore, the promotion of the use of ethanol gasoline can greatly reduce the dependence on petroleum resources and help to establish an ind...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C41/06C07C29/04C10L1/02
Inventor 杨伯伦
Owner XI AN JIAOTONG UNIV
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