Preparation method of polymer solvent iso-butane

A technology of isobutane and solvent, which is applied in the field of polymerizing solvent-grade isobutane, can solve the problems of low purity of isobutane, high olefin content, and no improvement, etc., and achieve the effect of improving economic benefits and saving production costs

Active Publication Date: 2010-03-17
MAOMING SHIHUA DONGCHENG CHEMICAL CO LTD
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AI Technical Summary

Problems solved by technology

Disadvantage The purity of the product isobutane is not high
The advantage of using desulfurization and gas separation device to produce isobutane is that the existing gas separation device can be used to transform and save investment, but the disadvantage is that the problem of high olefin content in the product cannot be solved
The advantage of the temperature swing adsorption purification process is that it can obtain isobutane products with a purity of 99.5-99.9%. However, due to the lack of desulfurization and deolefination processes, the total sulfur and total olefin content of isobutane still cannot meet the requirements of the polymerization solvent grade
[0004] In recent years, in view of the advantages and disadvantages of the above production processes, there has been no improvement in the process

Method used

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  • Preparation method of polymer solvent iso-butane

Examples

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Embodiment 1

[0024] Hydrocracking liquefied petroleum gas raw material composition (v%): ethane 1.13%, propane 14.2%, isobutane 47.44%, n-butane 33.36%, total butene (ppm) 71.0, carbon five or more 3.87%, total sulfur (ppm) 5.27~6.32.

[0025] Its preparation steps are:

[0026] (1) Mix hydrocracked liquefied petroleum gas and hydrogen at a volume ratio of 1:80, and then preheat to 280°C;

[0027] (2) send into hydrogenation reactor, there is hydrogenation catalyst in hydrogenation reactor, and loading capacity is 68% of effective volume of hydrogenation reactor, and this hydrogenation catalyst is made up of the raw material of following percentage by weight: molybdenum oxide 11 parts, 3 parts of cobalt oxide, 4 parts of nickel oxide, 80 parts of aluminum oxide, the control conditions of hydroprocessing:

[0028] Reaction temperature: 220°C, reaction pressure: 2.4MPa, reaction space velocity: 1.5h -1 ;

[0029] (3) send into desulfurization reactor, desulfurization agent zinc oxide is ...

Embodiment 2

[0037] Hydrocracking liquefied petroleum gas feedstock composition (v%): ethane 0.91-2.09%, propane 14.33-18.92%, propylene (ppm) 45.6-65.9, isobutane 46.12-48.39%, n-butane 28.95-33.22%, N-isobutene (ppm) 132.1-166.5, trans-butene-2 ​​(ppm) 37.6-58, cis-butene-223.21-33.9%, dimethylpropane (ppm) 0.03-224.3, carbon five or more 3.87-4.42%, total Sulfur (ppm) 5.27-6.32.

[0038] Its preparation steps are:

[0039] (1) Mix hydrocracked liquefied petroleum gas and hydrogen at a volume ratio of 1:100, and then preheat to 220°C;

[0040] (2) send into hydrogenation reactor, there is hydrogenation catalyst in hydrogenation reactor, and loading is 68% of effective volume of hydrogenation reactor, and this hydrogenation catalyst is made up of the raw material of following percentage by weight: 13 parts of molybdenum oxides, 2 parts of cobalt oxide, 6 parts of nickel oxide, 70 parts of aluminum oxide, the control conditions of hydroprocessing:

[0041] Reaction temperature: 220°C, r...

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Abstract

The invention relates to a preparation method of polymer solvent iso-butane, comprising the following preparing steps: (1) hydrocracking liquefied petroleum gas and hydrogen are mixed according to 1:80-100 of volume ratio, and then are pre-heated to 220-280 DEG C; (2) the mixture is fed in a hydrogenation reactor, hydro-treatment is carried out under the condition that a hydrogenation catalyst exists, and the control conditions of the hydro-treatment are that: the reaction temperature is 200-250 DEG C, the reaction pressure is 2.0-2.8 MPa and reaction air speed is 1-2h<-1>; (3) the mixture isfed in a desulphurization reactor, desulfurization is carried out under the condition that the desulfurater exists, and the control conditions of the desulfurization are that: the reaction time is 200-400 DEG C, the reaction pressure is 2.0-2.8MPa and the reaction air speed is 0.4-1h<-1>; (4) the product obtained in the step 3 carries out gas-liquid separation, the separated butane gas carries outC3 and C4 constituent separation, and then iso-butane is separated out from the C4 constituent, and the separated iso-butane is dehydrated to obtain finished products. Compared with the traditional process, the invention can obtain iso-butane products with 99.5-99.9 percent of purity and causes content of total sulfur and total olefins of the iso-butane to meet requirements of polymer solvent.

Description

technical field [0001] The invention relates to the technical field of chemical product production, in particular to a method for preparing high-purity, low-sulfur and low-olefin-containing polymerization solvent-grade isobutane by using hydrocracked liquefied petroleum gas as a raw material. Background technique [0002] Polymerized solvent-grade isobutane is made from the by-product liquefied petroleum gas fractions in the process of petroleum hydrocracking, and is produced through hydrofining, desulfurization and rectification technologies. It has high purity, low sulfur content, and low olefin content, etc. It is mainly used as a polymerization solvent in the production of high-density polyethylene by the loop pipe slurry method, and can also be used to replace Freon as a refrigerant. [0003] At present, there are three typical isobutane production processes: the common point is that they all use hydrocracking liquefied petroleum gas as raw material. One is to separate ...

Claims

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Application Information

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IPC IPC(8): C07C9/12C07C7/163B01J23/883
Inventor 曹光明
Owner MAOMING SHIHUA DONGCHENG CHEMICAL CO LTD
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