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Alkyne-rich C4 selective hydrogenation technology

A technology for selective hydrogenation and enrichment of alkynes, applied in the purification/separation of hydrocarbons and hydrocarbons, organic chemistry, etc., it can solve the problem of not maximizing the yield of butadiene, and reduce the amount of polymer generated. , reducing the formation of polymers, reducing the effect of alkyne content

Active Publication Date: 2016-05-11
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The loss of butadiene is unavoidable during the hydrogenation process, and the yield of butadiene has not been maximized

Method used

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  • Alkyne-rich C4 selective hydrogenation technology
  • Alkyne-rich C4 selective hydrogenation technology
  • Alkyne-rich C4 selective hydrogenation technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The following hydrogenation process is selected:

[0044] (1) The C4 material containing alkynes comes out of the extraction device or the tank area, and first enters the rectification tower. The pressure of the rectification tower is controlled at 0.5 MPa, the temperature of the tower top is controlled at 59 ° C, and the temperature of the tower bottom is controlled at 120 ° C. Separating the entrained impurities from C4, C4 is extracted from the top of the tower, condensed by the condenser and enters the reflux tank, and impurities are extracted from the bottom of the tower to the fuel tank;

[0045] (2) C4 is pressurized by the hydrogenation raw material pump, and a part is returned to the rectification tower as a reflux liquid, and the mass ratio of the reflux liquid amount to the discharge amount at the top of the tower is 0.5:1, and the other part is mixed with H 2 Mixed into the hydrogenation reactor, the molar ratio of hydrogen to the total alkyne at the reactor...

Embodiment 2

[0053] The feedstock of this embodiment is the raw material rich in alkyne, and the raw material is the same as in Example 1, and the palladium-lead-potassium polymetallic catalyst is loaded into the alkyne hydrogenation reactor, and its content is palladium 0.3wt%, lead 0.5wt%, potassium 0.5wt% %, the catalyst carrier is alumina, the hydrogenation reactor is an adiabatic fixed-bed reactor, the bed inlet is 30°C, the pressure is 1.5MPa, and the liquid space velocity of the high alkyne raw material is 1.0h -1 , the recycle ratio is 14:1, the molar ratio of hydrogen to alkyne is 1.2:1, the ratio of the first hydrogenation material returning to the rectification tower to the high alkyne material entering the tower is 2:1, and the rectification tower reflux ratio is 0.2. Table 2 lists the composition before and after the reaction.

[0054] Material composition before and after table 2 reaction

[0055]

[0056] As can be seen from Table 2, after 200 hours of operation, the ac...

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Abstract

The invention relates to a hydrogenation technology and concretely relates to an alkyne-rich C4 selective hydrogenation technology. The technology comprises that an alkyne-containing C4 material from an extracting device or a storage tank enters a rectifying tower, impurities and C4 in the alkyne-containing C4 material are separated, the C4 is collected at the tower top, is condensed through a condenser and is fed into a return tank, the impurities are collected at the tower bottom and are fed into a fuel tank, the C4 is pressurized through a hydrogenation raw material pump, one part of the C4 is used as a return liquid and is returned to the rectifying tower, the other part of the C4 and H2 are mixed and are fed into a hydrogenation reactor, the hydrogenated material is cooled through a cooler and is fed into a gas separation tank, noncondensable gas is fed to a torch, the liquid is divided into three parts through a circulating pump, the first part is returned to a feeding inlet of the rectifying tower, a second part is returned to an inlet of the hydrogenation reactor and the third part as a hydrogenation product is discharged from the device. The technology solves the problems of easy catalyst inactivation and polymerization of dialkene and alkyne in the reaction, improves butadiene and butylene recovery rates of the extracting device and effectively prolongs a service life of the hydrogenation catalyst.

Description

technical field [0001] The invention relates to a hydrogenation process, in particular to a selective hydrogenation process for alkyne-rich C4. Background technique [0002] The process of hydrocarbon steam cracking to olefins can produce saturated hydrocarbons such as ethane, propane, butane; unsaturated hydrocarbons such as ethylene, propylene, butene, butadiene; saturated hydrocarbons. [0003] Cracking mixed carbon four contains 40-50% of 1,3-butadiene, which is the main raw material for the production of rubber and resin, and the rest are mainly alkanes and olefins, and a small amount of alkynes, including methyl acetylene, Ethylacetylene and vinylacetylene. Cracking 1,3-butadiene in C4 hydrocarbons is generally obtained by two-stage solvent extraction, and the solvents are generally acetonitrile, dimethylformamide and N-methylpyrrolidone. The first stage separates butane, butene and butadiene, and extracts butane and butene; the second stage separates alkyne from bu...

Claims

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Application Information

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IPC IPC(8): C07C7/167C07C7/04C07C11/167C07C11/08
Inventor 彭光辉董凌云郭岩峰韩铁
Owner CHINA PETROLEUM & CHEM CORP
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