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Extraction of oxygenates from a hydrocarbon stream

A technology for oxygenates and hydrocarbon streams, applied in and below, the field of extracting oxygenates, can solve difficult and uneconomical problems

Inactive Publication Date: 2009-12-30
SASOL TEKHNOLODZHI PROPRIEHJTEHRI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This reference provides extraction with a single solvent, such as liquid sulfur dioxide or aqueous methanol, to isolate oxygenates, which has proven to be difficult and uneconomical in practice

Method used

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  • Extraction of oxygenates from a hydrocarbon stream
  • Extraction of oxygenates from a hydrocarbon stream
  • Extraction of oxygenates from a hydrocarbon stream

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This example shows a process according to the invention in which C 10 -C 13 The fraction removes oxygenates to low levels. Extraction column 20 was operated at a solvent / feed ratio of 1.25 and a temperature of 50°C. The overall olefin / paraffin recovery in stream 24 was 89.9%. The olefin / paraffin ratio was 1:3.7 in the feed and 1:3.6 after oxygenate extraction. The olefin / paraffin ratio is thus substantially maintained. The oxygenate content in stream 24 was only 0.0145%.

[0040] Extraction tower 20

[0041]

[0042] Raffinate stripper 23

[0043]

[0044] Solvent Recovery Tower 27

[0045]

Embodiment 2

[0047] This example shows a process according to the invention in which C 10 -C 13 The fraction removes oxygenates to a low level with a higher oxygenate feedstock concentration than Example 1 (12.36% by weight). Extraction column 20 was operated at a solvent / feed ratio of 2:1 and a temperature of 50°C. The overall recovery of olefins / paraffins in stream 24 was 91.4%. Again, the olefin / paraffin ratio was substantially maintained. The oxygenate content in stream 24 was only 0.0154%.

[0048] Extraction tower 20

[0049]

[0050] Raffinate stripper 23

[0051]

[0052] Solvent Recovery Tower 27

[0053]

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Abstract

The invention relates to a commercially feasible process for extracting oxygenates from a hydrocarbon stream, typically a fraction of the condensation product of a Fischer-Tropsch reaction, while preserving the olefin content of the condensation product. The oxygenate extraction process is a liquid-liquid extraction process that takes place in an extraction column using a mixture of methanol and water as the solvent, wherein an extract from the liquid-liquid extraction is sent to a solvent recovery column from which a top product comprising methanol, olefins and paraffins is recycled to the extraction column, thereby enhancing the overall recovery of olefins and paraffins.

Description

Background of the invention [0001] The present invention relates to a method of extracting oxygenates from hydrocarbon streams. [0002] A number of methods are known for extracting oxygenates from hydrocarbon streams. Such extraction methods include hydrogenation, azeotropic distillation, extractive distillation, vapor phase dehydration, liquid phase dehydration and liquid-liquid extraction. [0003] British Patent 669,313 in the name of California Research Corporation discloses the use of hydrocarbon condensate produced by the Fischer-Tropsch process as a feedstock in the manufacture of alkylbenzenes. This reference is limited to the production of hydrocarbon condensates using a "high temperature" Fischer-Tropsch process in which the Fischer-Tropsch reaction is carried out at temperatures of about 300°C and higher. This reference indicates that the manufactured Fischer-Tropsch feedstock results in poor quality linear alkylbenzenes due to odor and moisture problems caused b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C7/10C10G21/16C10G21/02
CPCC07C7/10C10G21/02
Inventor J·P·德韦W·詹森P·雅各布森
Owner SASOL TEKHNOLODZHI PROPRIEHJTEHRI LTD