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Preparation of pentane through hydrogenation of lightweight C5 fraction

A C5-fraction, light-weight technology, which is applied in the field of hydrogenation reaction to prepare pentane, can solve the problems of inapplicable hydrogenation of light C5-fraction, and achieve the effect of improving stability and simple process

Inactive Publication Date: 2012-11-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the content of diolefins and alkynes in the light C5 cut is usually as high as about 35 wt%, and this sulfurized catalyst is obviously not suitable for the hydrogenation of the light C5 cut

Method used

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  • Preparation of pentane through hydrogenation of lightweight C5 fraction
  • Preparation of pentane through hydrogenation of lightweight C5 fraction
  • Preparation of pentane through hydrogenation of lightweight C5 fraction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～10

[0025] The hydrogenation reaction is carried out in a stainless steel tubular reactor, and the reactor is a stainless steel tubular reactor with a size of φ25mm×1000mm. 100ml of catalyst is filled in the reaction tube. The catalyst is a supported catalyst with Ni as the active component and diatomite as the carrier. The weight percentage of Ni in the catalyst is 30-50%. The bottom of the reactor is filled with inert ceramic balls. The fresh catalyst needs to be activated with hydrogen before feeding.

[0026] The light carbon five fraction material is mixed with the hydrogenation product prepared in the previous experiment, and after preheating, the pump is used to send the hydrogenation reactor from the top at a set rate, and the mixed gas of hydrogen and CO enters the reactor through the gas distributor Inside, the light carbon five fraction material is mixed with the mixed gas of hydrogen and CO, and then enters the catalyst bed for hydrogenation reaction. The hydrogenatio...

Embodiment 11～15

[0041]Take part of the hydrogenation products obtained in the examples to remove residual unsaturated hydrocarbons and remove light components to obtain pentane products.

[0042] The hydrogenated product first passes through an adsorption reactor to remove unsaturated hydrocarbons. The adsorption reactor is a stainless steel tubular reactor, including a φ25mm×1000mm reaction tube, filled with granular clay, the granular clay has a particle size of 20-60 mesh, an acidity of ≤2.5KOHmg / g, and a packing density of 0.65-0.70 g / ml.

[0043] The deunsaturated hydrogenated product is then separated by rectification to remove the light ends. The theoretical plate number of the rectification tower is 20, the light fraction material is discharged from the top of the tower, and the product pentane is obtained at the bottom of the tower.

[0044] The process conditions of each embodiment adsorption process and rectification separation process are shown in Table 3.

[0045] Product pent...

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Abstract

The invention provides a preparation method for pentane through hydrogenation of a lightweight C5 fraction. The method comprises the following steps: 1) mixing the lightweight C5 fraction with a solvent and then subjecting the mixture to a hydrogenation reaction in the presence of mixed gas of CO and H2 under the action of a catalyst bed layer of a fixed bed, wherein the volume percentage content of CO in the mixed gas of CO and H2 is 0.0005 to 0.0020%, a used catalyst is a supported catalyst with Ni as an active component and diatomite as a supporter, and a part of a resultant of the hydrogenation reaction returns and is used as the solvent; 2) allowing the resultant of the hydrogenation reaction to pass through a granular white clay fixed bed so as to remove residual unsaturated hydrocarbons; and 3) carrying out rectification and separation on the resultant to remove light components. According to the invention, hydrogen containing CO, instead of pure hydrogen, is used during hydrogenation; on the premise that other hydrogenation conditions do not change, hydrogenation can be carried out on a lightweight C5 fraction material containing 0.0003 to 0.001 wt% of active sulfide, so the procedure of removal of active sulfide before hydrogenation can be omitted and stability of hydrogenation activity of the catalyst can be substantially improved.

Description

technical field [0001] The invention relates to a method for hydrogenation of C5 cuts containing unsaturated hydrocarbons, in particular to the preparation of C5 cuts containing unsaturated hydrocarbons through hydrogenation in the presence of a catalyst containing metal Ni as the active component. alkane method. Background technique [0002] During the steam cracking of naphtha to produce ethylene, a considerable amount of C5 fractions is produced as a by-product. At present, the most valuable comprehensive utilization of C5 fractions is to obtain piperylene, which has high economic value, through extraction and rectification separation. Three diolefins are isoprene and dicyclopentadiene. Before diolefins are separated by extraction and rectification, a part of the C5 material containing C4 light hydrocarbons must be separated out. This part of the material accounts for about 30wt% of the total C5 fraction. This material is usually called light in industry. carbon five di...

Claims

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Application Information

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IPC IPC(8): C07C9/15C07C9/18C07C5/03B01J23/755
Inventor 徐泽辉汤玉娟陆鑫
Owner CHINA PETROLEUM & CHEM CORP
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