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Washing recycling process for decahydronaphthalene from hydrogen

A decahydronaphthalene and exhaust gas technology, applied in gas treatment, hydrocarbons, absorption purification/separation, etc., can solve problems such as oxygen interference and dust blockage, and achieve the effect of avoiding dust blockage and strong adaptability of gas source

Inactive Publication Date: 2017-09-26
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 decahydronaphthalene water washing recovery process, which uses a combination of water washing and adsorption to recover decahydronaphthalene in the waste gas, so as to solve the problems of dust blockage and oxygen interference in the prior art

Method used

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  • Washing recycling process for decahydronaphthalene from hydrogen

Examples

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Effect test

Embodiment 1

[0022] A spinning workshop uses an exhaust fan to extract the air containing decahydronaphthalene from the tunnel, where the concentration of decahydronaphthalene is 3000ppm, and there is a lot of dust in addition. The mixed gas is directly sent to the water washing tower through the axial flow fan, and after being washed with washing water and the liquid droplets are removed by the wire mesh demister, it is directly sent to the adsorption system. After testing, the removal rate of dust in the mixed gas after washing with water is over 99%. , the concentration of decahydronaphthalene in the gas is reduced to 500ppm, and the adsorption tower uses expanded graphite as the adsorbent. The adsorbent after adsorption saturation is taken out, and the oil is squeezed out by extrusion, and then reloaded into the adsorption tower for circulation. The purity of extruded decahydronaphthalene can reach more than 99%.

Embodiment 2

[0024] A spinning workshop uses nitrogen to purge from the pre-drawing hot box and hot seven rolls to form a mixed gas containing decahydronaphthalene with a concentration of 900ppm, and the gas contains a certain amount of dust. The mixed gas is buffered by the buffer tube and sent directly to the water washing tower by the axial flow fan. After being washed with washing water and the liquid droplets are removed by the wire mesh demister, it is directly sent to the adsorption system, and the dust removal in the washed mixed gas is tested. The concentration of decahydronaphthalene in the gas will reach 300ppm. The adsorption tower uses activated carbon as the adsorbent, and uses 0.2MPa saturated steam to purge and regenerate. After condensation and oil-water separation, decahydronaphthalene with a purity of more than 98% can be obtained. naphthalene liquid.

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Abstract

A washing recycling process for decahydronaphthalene from hydrogen is used for recycling the decahydronaphthalene from the hydrogen by a mode of combining washing and adsorption, is suitable for collecting decahydronaphthalene-containing waste gas in a fiber spinning workshop, and belongs to the technical field of environmental protection. The decahydronaphthalene-containing waste gas directly enters a gas distributor at the bottom of a washing tower, decahydronaphthalene in the waste gas is captured into washing water and then enters the lower part of the washing tower, and after most of liquid drops of purified gas are removed by a wire mesh demister, the purified gas is further treated at the position out of the interface. The decahydronaphthalene in the washing water is removed by expanded graphite, activated carbon and the like, the purified washing water circulates to the washing tower, an adsorbent which is saturated is regenerated in a steam blowing or extruding mode, and finally the decahydronaphthalene as a liquid product is obtained. The process is particularly suitable for decahydronaphthalene waste gas which contains dust and oxygen. Compared with a single adsorption and film separation process, the washing recycling process has the characteristics that the problems of dust blockage, oxygen interference and the like are avoided.

Description

technical field [0001] The water washing recovery process of decahydronaphthalene in exhaust gas belongs to the technical field of environmental protection, and is mainly aimed at mixed gases containing decahydronaphthalene with different compositions and concentrations. Background technique [0002] High-performance polyethylene fiber is the basic raw material for the development of national defense, aerospace, new energy and high-tech industries. With the continuous improvement of the performance of high-performance polyethylene fibers and the continuous expansion of application fields, high-performance polyethylene fiber spinning technology has been receiving more and more attention. In the dry spinning process of polyethylene fibers, decahydronaphthalene is commonly used as a swelling solvent. However, in the subsequent processes of spinning, washing and drawing, and drying, the volatilization of decahydronaphthalene is a serious problem. Since decahydronaphthalene is a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D47/06B01D53/04C07C7/11C07C7/12C07C13/50
CPCB01D47/06B01D53/047B01D2253/102B01D2257/708C07C7/005C07C7/11C07C7/12C07C13/50Y02P70/10
Inventor 于品华孔凡敏王祥云毛松柏
Owner CHINA PETROLEUM & CHEM CORP