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Process for the purification of an aqueous stream coming from the fischer-tropsch reaction

A liquid and reactive technology, applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, water/sludge/sewage treatment, etc., can solve the problem that organic compounds cannot be completely discharged and/or regenerated

Inactive Publication Date: 2011-02-02
ENI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] However, due to the solubility of organic compounds in water and the inability of organic compounds to be completely discharged and / or regenerated without further purification treatment, the resulting liquid stream includes various pollutants which are also corrosive

Method used

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  • Process for the purification of an aqueous stream coming from the fischer-tropsch reaction
  • Process for the purification of an aqueous stream coming from the fischer-tropsch reaction
  • Process for the purification of an aqueous stream coming from the fischer-tropsch reaction

Examples

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Embodiment 1

[0062] A pump set with impellers submerged in a well of less than 7 m in height relative to the bottom of the stripping column receives a liquid stream having a temperature equal to about 290 kg / h at a temperature equal to 101.4° C. for a pressure corresponding to 1030 hPa flow. The pump brings the water under pressure back to the 45 bar value it assumes at the inlet of the sensitive contact heat exchanger. The methane gas stream is delivered at a flow rate of less than 325 kg / h, a temperature of about 25°C and a pressure equal to the inlet pressure of water.

[0063] The heat exchanger is manufactured to achieve a performance equal to 5 theoretical thermodynamic steps, in fact, an inlet temperature of pressurized water equal to 105°C corresponds to an outlet temperature equal to 40°C, remembering that there is no insulation.

[0064] Regardless of the fact that the flow rate being added to the outgoing gas stream has been reduced by 7 kg / h, the data representing the composit...

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Abstract

The present invention relates to a process for the purification of an aqueous stream coming from the Fischer-Tropsch reaction which comprises: feeding the aqueous stream containing organic by products of the reaction to a fractionating distillation column or to a stripping column,- condensation of the vaporized stream leaving the head of the column and the removal of a distillate enriched in the heaviest by-products,- feeding the partially purified aqueous stream leaving the bottom of the distillation column, at the head to one or more sensible contact exchangers,- sending a process gas in countercurrent to the tail of the exchanger at a temperature lower than that of the aqueous stream,- sending the process gas enriched in water and part of the residual organic product leaving the head of the exchanger to the Fischer-Tropsch synthesis plant of hydrocarbons,- sending the purified colder water leaving the exchanger directly to further treatment.

Description

technical field [0001] The present invention relates to a method for purifying an aqueous stream from a Fischer-Tropsch reaction. [0002] More particularly, the present invention relates to a method for purifying a liquid stream from a Fischer-Tropsch reaction based on a system comprising a distillation column and one or more contact sensible heat exchangers. Background technique [0003] The Fischer-Tropsch technique for the production of hydrocarbons from gas mixtures based on hydrogen and carbon monoxide, commonly referred to as synthesis gas, is known in the scientific literature. An overview of major work in Fischer-Tropsch Synthesis is contained in Bureau of the Mines Bulletin, 544 (1955) entitled "Bibliography of the Fischer-Tropsch Syntheses and Related Processes" by H.C. Anderson, J.L. Wiley e A. Newell (H.C. Anderson, J.L. Wiley e A. Newell in Bureau of Mines Bulletin, No. 544, 1955, entitled "Bibliography of Fischer-Tropsch Synthesis and Related Methods"). [0...

Claims

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Application Information

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IPC IPC(8): C02F1/20C10G2/00C02F1/04
CPCC02F1/04C02F9/00C02F1/20C10G2/32C10G2300/1022C10G2300/80C10G2300/202C10G2300/1025
Inventor L·洛卡泰利G·克莱里希
Owner ENI
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