Method for preparing monoolefine from diolefin through hydrogenation

A technology of diolefins and monoolefins, which is applied in the field of hydrogenation of diolefins to monoolefins, which can solve the problems of large mass transfer resistance, long residence time, reduced conversion rate and selectivity of hydrogenation reaction, etc.

Active Publication Date: 2021-06-04
SINOPEC JINLING PETROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In a selective hydrogenation reaction, C 10 ~C 15 Diolefins will enter the pores of the catalyst carrier during the reaction, diffuse from the surface of the catalyst through the pores to the interior of the catalyst, and the C produced by the reaction 10 ~C 15 The monoolefin then diffuses from the inside of the catalyst through the pores to the surface

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The preparation of embodiment 1 catalyst A

[0031] In this example, an alumina powder with two types of pores (the pore size distribution ranges of the two types of pores are 10-20nm and 150-300nm respectively) is used to prepare the second layer of carrier, and mullite is used as the first layer of carrier , effectively combined to obtain a carrier containing inner and outer layers, and to prepare a catalyst.

[0032] Take 500 grams of high-purity Al 2 o 3 powder, 196 grams of high-purity SiO 2 Powder, 70 grams of water, 10 grams of 10% nitric acid were mixed, kneaded for 1 hour, pressed into pellets, placed in a closed space at 70°C under constant temperature and humidity conditions and continued to react for 10 hours, and then dried at 150°C for 2 hours. Then bake at 1450° C. for 1 hour to obtain the first layer of carrier pellets with a diameter of 2.0 mm. XRD analysis showed mullite crystal form.

[0033] Take 50 grams of alumina powder (with two types of por...

Embodiment 2

[0036] The preparation of embodiment 2 catalyst B

[0037] In this example, alumina powder with one type of pores (the range of pore size distribution is 15-30nm) is used, and the pore-forming agent methylcellulose is added to prepare the second layer of carrier with two types of pores. As the first carrier, it is effectively combined to obtain a carrier containing inner and outer layers, and a catalyst is prepared.

[0038] The first layer of carrier was prepared according to the method of Example 1.

[0039] Take 50 grams of alumina powder (with one type of pores, the pore size distribution range is 15-30 nm), 20 grams of 20% nitric acid, 12 grams of methyl cellulose, and 600 grams of water are mixed and stirred to prepare alumina slurry. Molded according to the method of Example 1, a carrier containing inner and outer layers was obtained. Analysis showed that the thickness of the second layer of support was 110 μm, and the ratio of the diameter of the first layer of suppo...

Embodiment 3

[0042] The preparation of embodiment 3 catalyst C

[0043] In this example, an alumina powder with two types of pores (the pore size distribution ranges of the two types of pores are 8-18nm and 200-500nm respectively) is used to prepare the second layer of carrier, and mullite is used as the first layer of carrier , effectively combined to obtain a carrier containing inner and outer layers, and to prepare a catalyst.

[0044] The first layer of carrier was prepared according to the method of Example 1.

[0045] Take 50 grams of alumina powder (with two types of pores, the pore size distribution ranges of the two types of pores are 8-18nm and 200-500nm respectively), 20 grams of 20% nitric acid, and 600 grams of water are mixed and stirred for 2 hours to prepare alumina material pulp. Molded according to the method of Example 1, a carrier containing inner and outer layers was obtained. Analysis showed that the thickness of the second layer of support was 240 μm, and the rati...

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Abstract

The invention relates to a method for preparing monoolefine from diolefine through hydrogenation, in particular to a method for preparing monoolefine from C10-C15 diolefine through hydrogenation. The method is characterized by comprising the following steps that in a plurality of hydrogenation reactors connected in series, an alkane olefin mixture flow containing C10-C15 monoolefine and C10-C15 diolefine makes contact with a specific hydrogenation catalyst under hydrogenation reaction conditions, hydrogen is respectively injected into each reactor, the catalyst is formed by combining an inner substance and an outer substance with different properties, the inner first-layer substance has lower porosity, the outer second-layer substance has first-type pores and second-type pores, the maximum value of the pore size distribution of the first-type pores is 4-50nm, and the maximum value of the pore size distribution of the second-type pores is 100- 1000 nm. The catalyst has relatively low permeability of the first layer of noble metal carrier and is beneficial to recovery of noble metal, and the method has outstanding selectivity and activity in a diolefin selective hydrogenation reaction process.

Description

technical field [0001] The application relates to a method of hydrogenating diolefins into monoolefins, in particular to a method of making C 10 ~C 15 Process for the hydrogenation of diolefins to monoolefins. Background technique [0002] Long-chain hydrocarbons are involved in the production of synthetic detergents and various surfactants, such as in the process of dehydrogenation to produce detergent raw materials - linear alkylbenzene C 10 ~C 15 The monoolefin products produced by the dehydrogenation of long-chain alkanes contain a small amount of diolefins. The presence of these diolefins will cause a large number of side reactions in the subsequent alkylation process, reducing the yield and quality of alkylbenzene. The selective hydrogenation of diolefins in the dehydrogenation product by the method of selective hydrogenation of diolefins to generate monoolefins can effectively improve the quality of alkylbenzenes on the basis of increasing the yield of alkylbenzene...

Claims

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Application Information

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IPC IPC(8): C07C5/05C07C11/02B01J32/00B01J37/02B01J35/10B01J21/12B01J37/10B01J37/18B01J23/50
CPCC07C5/05B01J37/0215B01J37/0201B01J35/1061B01J35/1066B01J35/1071B01J35/109B01J35/1038B01J35/1009B01J35/1014B01J21/12B01J37/10B01J37/18B01J23/50B01J37/0018B01J35/1042B01J35/1047C07C2523/50C07C2521/12C07C11/02B01J21/00B01J35/10B01J37/02C07C5/02C07C5/03
Inventor 刘冬王玉许正跃蔡吉乡凌正国曹晶耿祖豹邱祥涛赵宏仪许艺施祖伟
Owner SINOPEC JINLING PETROCHEMICAL CO LTD
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