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Process for the treatment of the aqueous stream coming from the fischer-tropsch reaction by means of ion exchange resins

An exchange resin, ion exchange technology, applied in ion exchange treatment device, ion exchange water/sewage treatment, ion exchange, etc., can solve the problems of organic compounds cannot be upgraded, and biological treatment is expensive.

Inactive Publication Date: 2012-11-14
ENI SPA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Biological treatment is generally expensive as a result of the chemicals used (e.g. urea, phosphate, etc.), the large volume of treatment tanks / reactors, the time of the biological reaction in hours and the air blown in when aerobic treatment is used of
Another harmful effect of biological treatment is that the organic compounds present in the water cannot be upgraded

Method used

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  • Process for the treatment of the aqueous stream coming from the fischer-tropsch reaction by means of ion exchange resins
  • Process for the treatment of the aqueous stream coming from the fischer-tropsch reaction by means of ion exchange resins
  • Process for the treatment of the aqueous stream coming from the fischer-tropsch reaction by means of ion exchange resins

Examples

Experimental program
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Embodiment 1

[0059] As described in patent US 6,348,510 (IFP-ENI) and reference figure 1 After performing the Fischer-Tropsch reaction, the water separated from the reaction effluent (stream 1) by decantation is supplied to the distillation column (10). The alcohol-rich aqueous stream (stream 2) is separated from the top of the column, and its composition obtained by gas chromatography is reported in Table 1.

[0060] Table 1 reports the composition of water separated from the reaction effluent by decantation (stream 1) obtained by gas chromatography.

[0061] Then its composition was obtained by gas chromatography (for the determination of alcohol content) and ion chromatography (for the determination of organic acid content) and was reported in Table 1 and was fed to the aqueous stream leaving the bottom of the distillation column (stream 3) AMBERLYST A24 type anion exchange resin bed of Rohm & Haas (20). After flowing 12 BV with the aqueous stream leaving the bottom of the distillation colu...

Embodiment 2

[0065] As described in patent US 6,348,510 (IFP-ENI) and reference image 3 After performing the Fischer-Tropsch reaction, the water separated from the reaction effluent (stream 1) by decantation is supplied to the distillation column (10).

[0066] Table 2 reports the composition of the water separated from the reaction effluent by decantation obtained by gas chromatography.

[0067] The alcohol-rich stream (stream 2) whose composition was obtained by gas chromatography and reported in Table 2 was separated from the top of the column. Its composition is obtained by gas chromatography (for the determination of alcohol content) and ion chromatography (for the determination of organic acid content) and is reported in Table 2 for the 85BV aqueous stream leaving the bottom of the column (stream 3). Resin bed as described in Example 1. The stream leaving the resin bed (stream 5) is all collected and analyzed for the presence of organic acids by means of ion chromatography. The result...

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Abstract

The invention provides a process for the treatment of the aqueous stream coming from the Fischer-Tropsch reaction comprising: feeding the aqueous stream containing the organic by products of the reaction to a distillation or stripping column; separation from the column of an aqueous stream enriched in alcohols having from 1 to 8 carbon atoms and other possible volatile compounds; and feeding the aqueous stream containing the organic acids leaving the bottom of the distillation column to an ion exchange step wherein said aqueous stream is put in contact with an anionic exchange resin bed and the production of two outgoing aqueous streams: an aqueous stream (i) enriched in organic acids having from 1 to 8 carbon atoms; and a purified aqueous stream (ii) with a low content of organic acids.

Description

Technical field [0001] The present invention relates to a method for treating water by-produced in Fischer-Tropsch synthesis by means of ion exchange resins. [0002] More particularly, the present invention relates to a method for treating water that is by-produced in a Fischer-Tropsch synthesis by means of a combination of a distillation / stripping step and an ion exchange step. Background technique [0003] The Fischer-Tropsch technology for the production of hydrocarbons from a gas mixture based on hydrogen and carbon monoxide, called synthesis gas, is well known in the scientific literature. The Bureau of Mines Bulletin, 544 (1955), titled "Bibliography of the Fischer-Tropsch Synthesis and Related Processes" H.C. Anderson, J.L. Wiley and A. Newell contains a summary of the main work of the Fischer-Tropsch reaction. [0004] The liquid hydrocarbon preparation process by means of the Fischer-Tropsch reaction produces a larger amount of water by weight than the amount of the hydroc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/42C02F1/04
CPCB01J45/00B01J39/04B01D1/0017B01D1/22B01J41/04C02F1/683C02F1/04C02F1/4693C02F2001/422B01D3/002C02F2001/425C02F2103/365C02F1/42B01J47/026
Inventor R·米格里奥R·比格纳兹
Owner ENI SPA