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Prodn. of olefins

A technology for olefins and dienes, which is applied in the field of cracking olefin-rich hydrocarbon raw materials, and can solve problems such as catalyst stability issues that have not been raised

Inactive Publication Date: 2005-07-06
FINA RES SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The description also only exemplifies the olefin conversion process in a short period of time (such as a few hours), and does not address the issue of ensuring the stability of the catalyst over a longer period of time (such as at least 160 hours or several days) required in industrial production.

Method used

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  • Prodn. of olefins
  • Prodn. of olefins
  • Prodn. of olefins

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] In this example, lightly cracked naphtha (LCN) was cracked in the presence of crystalline silicate. The catalyst is a silicalite formulated with a binder, which is pretreated by heating (in steam) (as described below), dealuminated with an aluminum complexing agent to extract aluminum from it, and finally calcined. The catalyst is then used to crack olefins in the hydrocarbon feedstock, and an effluent with substantially the same olefin content as the feedstock is produced through a catalytic cracking process.

[0091]In the catalyst pretreatment, silicalite obtained by the company UOP Molecular SievePlant of POBox 11486, Linde Drive, Chickasaw, AL 36611, USA under the trade name S115, is extruded into pellets together with a binder containing precipitated silica. The binder accounts for 50% by weight of the silicalite / binder mixture obtained. More specifically, 538 g of precipitated silica (commercially available from Degussa AG of Frankfurt, Germany under the trade name F...

Embodiment 2

[0114] Example 1 was repeated using different raw materials. The raw material was not lightly cracked naphtha, but fractionated C obtained from lightly cracked naphtha. 5 Distillate. In addition, during the catalytic cracking process, the inlet temperature is 548℃, and the hydrocarbon outlet pressure is about 1×10 5 N / m 2 (1 bar) (ie normal pressure).

[0115] Table 4 shows the C from LCN 5 Distillate feedstock, such as the hydrogenation feedstock after diolefin hydrogenation in Example 1, and the distribution of hydrocarbon substances in the effluent after the cracking process. It can be seen that the raw material initially mainly contains C 5 After the catalytic cracking process, the olefin content is basically the same, but C in the effluent 5 The amount of the substance is significantly reduced compared to the amount of the substance in the original raw material. Similarly, C 2 -C 4 Light olefins can be easily fractionated from the effluent, leaving C with the composition show...

Embodiment 3

[0118] Use C from the MTBE unit of the refinery 4 The raffinate (raffinate II) was used as a raw material instead of slightly cracked naphtha to repeat Example 1. In addition, the inlet temperature of the feedstock is about 560°C, and the hydrocarbon outlet pressure is about 1×10 5 N / m 2 (1 bar) (atmospheric pressure).

[0119] It can be seen from Table 7-9 that C 2 And the main C 3 Alkenes from C 4 The olefin feedstock is prepared according to the method of the present invention. About 34.5% of the olefin content in the effluent as C 2 And / or C 3 Alkenes exist, C 2 And / or C 3 The olefins are easily fractionated from the effluent, and the propylene yield based on olefins is 29%.

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Abstract

A process for cracking an olefin-rich hydrocarbon feedstock which is selective towards light olefins in the effluent, the process comprising contacting a hydrocarbon feedstock containing olefins having a first composition of one or more olefinic components with a crystalline silicate catalyst to produce an effluent having a second composition of one or more olefinic components, the feedstock and the effluent having substantially the same olefin content by weight therein as the feedstock.

Description

Technical field [0001] The present invention relates to a method for cracking olefin-rich hydrocarbon feedstock, which is selective to light olefins in the effluent. Especially olefin feedstock from refineries or petrochemical plants can be selectively converted to redistribute the olefin content of the feedstock in the effluent produced. Background technique [0002] It is known in the prior art to use zeolite in the catalytic dewaxing of petroleum feedstocks to convert long-chain paraffins into lighter products. Although this is not the purpose of dewaxing, at least part of the paraffins are converted to olefins. In this method, it is known to use crystalline silicate, such as MFI-type crystalline silicate. The three-letter name "MFI" represents a specific crystalline silicate confirmed by the Structure Commission of the International Zeolite Association (StructureCommission of the International Zeolite Association) Salt structure type. Examples of MFI-type crystalline silicate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G11/05C10G69/04B01J29/035
CPCC10G11/05C10G2400/20C10G2300/4018C10G2300/4025C10G2300/1044
Inventor 让-皮埃尔·达思卢克·德洛姆雅克-弗兰克伊斯·格鲁特詹斯泽维尔·范黑伦沃尔特·弗梅伦
Owner FINA RES SA
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