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Separation of oxygenates from a hydrocarbon stream

A technology for hydrocarbon streams and oxidation, which is applied in the direction of refining hydrocarbon oil, petroleum industry, refining with two or more solvents, etc.

Inactive Publication Date: 2004-01-14
SASOL TEKHNOLODZHI PROPRIEHJTEHRI LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

The process described does not involve the recovery of oxides from the extract

Method used

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  • Separation of oxygenates from a hydrocarbon stream
  • Separation of oxygenates from a hydrocarbon stream

Examples

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Embodiment

[0035] A 3-meter-high vertical rotating disk extraction column, which is a multi-stage contact device, was operated under liquid-liquid extraction conditions. Supply points are installed at the top, bottom and middle of the extraction tower to feed separately. The solvent consisted of acetonitrile with 18% water. The solvent enters the extraction column from the top feed point at a flow rate of 2 kg / h. The stripping solvent was 1-octene (comonomer grade). The stripping solvent was introduced into the extraction column at a rate of 1 kg / h from the bottom feed point at a height of 2 m. The Fischer-Tropsch reaction was carried out in a slurry bed reactor using iron / manganese / zinc catalysts at a pressure of 45 bar and a reaction temperature of 230°C, with the resulting condensate as feed. The extraction operation was carried out at an operating temperature of 45°C. The solvent forms the continuous phase and the interface is at the top of the extraction column. For the particu...

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Abstract

This invention relates to a method for separating olefins and paraffins from oxygenates in a liquid hydrocarbon stream containing a high proportion of olefins, paraffins and oxygenates (mainly alcohols). Typically, the hydrocarbon stream is obtained from a Fischer-Tropsch process. The organic counter-solvent has a boiling point which is less than the boiling point of the most volatile alcohol in the hydrocarbon stream. A raffinate from the liquid-liquid extractor is passed to a distillation column. A bottoms product from the distillation column comprises olefins and paraffins, and the overhead product comprising solvents is recycled. An extract from the liquid-liquid extractor is sent to a stripping column, where a bottoms product containing pure alcohol is obtained. The overhead product containing counter-solvent is recycled.

Description

technical field [0001] The invention relates to a process for separating olefins and alkanes from oxygenates in liquid hydrocarbon streams. Background technique [0002] The synthesis gas in the Fischer-Tropsch reactor reacts under the conditions of high temperature, high pressure and the use of iron or cobalt catalysts to produce a series of hydrocarbon compounds containing alkanes, alkenes and alcohols, whose carbon chain length varies from 1 to more than 100. The Fischer-Tropsch reaction can occur above 300°C. Generally speaking, if the operating temperature is in the range of 200°C to 260°C, a fixed bed or slurry reactor can be used. The iron / manganese / zinc catalysts show high selectivities to olefins and oxides (mainly alcohols) with chain lengths from 2 to over 30 when used at operating pressures of 30 to 60 bar. [0003] In prior art processes for extracting alpha-olefins from Fischer-Tropsch reaction product streams the first distillation operation increases the co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G21/04C10G21/14C10G53/04
CPCC10G21/04
Inventor 约翰·彼得·德·韦特雅各布·约翰尼斯·塑尔茨
Owner SASOL TEKHNOLODZHI PROPRIEHJTEHRI LTD
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