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Process to separate colour bodies and/or asphalthenic contaminants from a hydrocarbon mixture

A hydrocarbon mixture, asphaltene technology, applied in the field of separation of color bodies and/or asphaltene pollutants, can solve problems such as excessive coking

Inactive Publication Date: 2008-07-23
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Direct use of these relatively inexpensive feedstocks by the steam cracking process described above is not possible due to excessive coking of the convection zone and associated steam cracking furnace due to contaminants and / or colored bodies in the feedstock
[0003] A disadvantage of the method described in WO-A-9927036 is that the flow quickly changes from a maximum value of eg 1200 kg / m 2 Days to low values ​​that do not make economic sense, the flux is expressed as the amount of raw material that permeates through the membrane per square meter per day

Method used

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  • Process to separate colour bodies and/or asphalthenic contaminants from a hydrocarbon mixture

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Embodiment Construction

[0028] A black condensate with the characteristics shown in Table 1 was fed into the membrane separation unit at a flow rate of 70kg / h, where part of the retentate was recycled and mixed with fresh feedstock, so that the fluid flow rate on the feed side of the membrane was 1000kg / h. The membrane separation unit was equipped with a 1.5 m 2 A PDMS / PAN 150 membrane comprising a polydimethylsiloxane (PDMS) top layer and a polyacrylonitrile (PAN) support layer. When separated, the pressure difference is 20×10 5 Pa (20bar), the pressure on the permeate side is close to atmospheric pressure. The operating temperature was 70°C. The ASTM color of the permeate was 1.5.

[0029] The whole test time is 24h. Permeate flow was stopped by manually closing the valve in the permeate removal line for 5 minutes every approximately 55 minutes of normal separation time. During this time, it was found that the pressure on the permeate side was close to the pressure on the feed side, at 1×10 5...

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Abstract

Process for separating colour bodies and / or asphalthenic contaminants from a hydrocarbon mixture using a membrane having a feed side and a permeate side, by contacting the hydrocarbon mixture with the feed side of the membrane, wherein between the feed and permeate sides of the membrane a pressure difference is applied, thereby passing part of the hydrocarbon mixture from the feed side to the permeate side and obtaining at the permeate side of the membrane a hydrocarbon permeate having a reduced content of colour bodies and / or asphalthenic contaminants, and by removing the hydrocarbon permeate from the permeate side of the membrane, wherein during selected time intervals the removal of hydrocarbon permeate from the permeate side of the membrane is stopped so that the pressure difference over the membrane is temporarily substantially lowered.

Description

technical field [0001] The present invention relates to a method for the separation of colored bodies and / or asphaltene contaminants from hydrocarbon mixtures using membranes by allowing a portion of the hydrocarbon mixture to permeate from the feed side to the permeate side of the membrane by applying a pressure differential across the membrane , thereby obtaining a hydrocarbon permeate with reduced levels of color body and / or asphaltene contaminants on the permeate side of the membrane and removing the hydrocarbon permeate from the permeate side of the membrane. Background technique [0002] Such a method is known from WO-A-9927036. This publication discloses a process for the production of lower olefins from contaminated feedstocks using the well-known steam cracking process. Before the above-mentioned contaminated feedstock is fed into the steam cracking furnace, the contaminants are removed from the feedstock by membrane separation. Removal of contaminants in the feed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G31/11B01D61/02B01D65/08B01D61/00B01D65/02
CPCB01D65/02B01D2321/08B01D61/027B01D61/025C10G31/11B01D65/08B01D61/02
Inventor J·L·W·C·登伯斯泰尔特J·范韦斯特尼恩
Owner SHELL INT RES MAATSCHAPPIJ BV
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