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Method for processing safety gas

A treatment method and safe technology, applied in separation methods, chemical instruments and methods, nitrogen purification/separation, etc., to achieve the effects of low maintenance costs, small footprint, and long service life

Active Publication Date: 2016-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a new processing method for safety gas in order to overcome the defects of existing safety gas treatment methods

Method used

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  • Method for processing safety gas
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Embodiment approach

[0025] According to a preferred embodiment of the present invention, the material of the first stage membrane is silicone rubber polymer, polyimide, polysulfone, polyethersulfone, ethyl cellulose, polycarbonate and polyvinylidene fluoride At least one of them, the material of the second stage membrane is at least one of silicone rubber polymer, polyimide, polysulfone and ethyl cellulose. In addition, more preferably, the first-level membrane is a composite polymer membrane, and the second-level membrane is a single-layer polymer membrane, and the combination of this preferred second-level membrane is more conducive to the recovery of the solvent in the safety gas . Specifically, the first-level membrane is particularly preferably a composite membrane comprising a porous support membrane and a surface active layer membrane attached to the surface of the porous support membrane, and the porous support membrane is made of polyimide, polysulfone, poly At least one of ether sulfon...

Embodiment 1-4

[0034] Examples 1-4 are used to illustrate the safety gas treatment method provided by the present invention.

[0035] The solvent dewaxing safety gas enters the gas storage tank after pretreatment (separation of water and oil at low temperature), and three pretreated safety gases A, B and C are obtained respectively, and their compositions are shown in Table 1. The safety gas from the gas storage tank reaches the membrane separation temperature through heat exchange, and the first-stage membrane is used for the first-stage membrane separation to obtain the first permeate gas rich in solvent vapor and the first retentate gas rich in nitrogen and oxygen. After the first retentate gas reaches the membrane separation temperature through heat exchange, the second-stage membrane is used for second-stage membrane separation to obtain a second retentate gas rich in nitrogen and a second permeate gas rich in oxygen. The first permeate gas is removed from the solvent storage tank, the ...

Embodiment 5

[0037] This embodiment is used to illustrate the safety gas treatment method provided by the present invention.

[0038] The safety gas was treated according to the method of Example 1, except that the temperature of the second-stage membrane separation was 45°C. Wherein, the pretreatment, the conditions of the first membrane separation and the second membrane separation and the obtained results are shown in Table 2.

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Abstract

The invention provides a method for processing safety gas. The safety gas contains nitrogen, oxygen and solvent steam. The method is characterized in that first-stage membrane separation is carried out on the safety gas; under the first-stage membrane separation condition the safety gas is separated to obtain a first penetration gas rich in solvent steam and a first permeating residual gas rich in nitrogen and oxygen; then second stage membrane separation is carried out on the first permeating residual gas; under the second stage membrane separation condition, the first permeating residual gas is separated to obtain a second permeating residual gas rich in nitrogen and a second penetration gas rich in oxygen; and the content of the oxygen in the second permeating residual gas is no higher than 5.5 volume%. According to the provided method, oxygen content of the safety gas is reduced to a safe scope, nitrogen and solvent in the safety gas can be fully recovered and used, so that complementary quantity of nitrogen is reduced, discharge capacity of safety gas and the solvent can be reduced, and pollution of de-waxing solvent discharge on the environment can be reduced.

Description

technical field [0001] The invention relates to a processing method of safety gas. Background technique [0002] In the production process of lubricating base oil, it is necessary to reduce the pour point of the oil, which is mainly carried out by solvent dewaxing, propane dewaxing, cold pressing dewaxing, urea dewaxing and other methods. Among them, solvent dewaxing has the characteristics of mature technology, large processing capacity, strong raw material applicability, relatively low production cost, and easy availability of dewaxing solvents, etc., and has been widely used in the production process of base oil. [0003] The solvent dewaxing process is that the dewaxing raw material is sequentially added with a diluting solvent, and then cooled and crystallized. As the oil temperature decreases, the wax crystallizes and precipitates to form a dewaxed slurry, which is frozen to the filtration temperature. The dewaxed slurry is filtered through a drum filter to obtain a de...

Claims

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Application Information

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IPC IPC(8): B01D53/22C01B21/04
Inventor 丁洛管翠诗王玉章蔡晨程志斌闫亮
Owner CHINA PETROLEUM & CHEM CORP