Purification recovery method of Fischer-Tropsch synthesis water

Abstract

The invention discloses a purification recovery method of Fischer-Tropsch synthesis water, which comprises the following steps: (1) adding inorganic alkali into Fischer-Tropsch synthesis water to carry out acid-alkali neutralization reaction, thereby obtaining Fischer-Tropsch synthesis water containing oxygenated organic substance and carboxylate; (2) delivering the Fischer-Tropsch synthesis water containing oxygenated organic substance and carboxylate into a rectification tower to carry out rectification, and separating to obtain non-acid oxygenated organic substance and Fischer-Tropsch synthesis water containing carboxylate; (3) removing carboxylate in the Fischer-Tropsch synthesis water containing carboxylate to obtain desalted Fischer-Tropsch synthesis water; and (4) carrying out oxygenolysis on the oxygenated organic substance in the desalted Fischer-Tropsch synthesis water to obtain the recoverable Fischer-Tropsch synthesis water. The method can maximally recover the oxygenated organic substance, such as non-acid oxygenated organic substance, in the Fischer-Tropsch synthesis water on the premise of achieving the goal of purifying and recovering Fischer-Tropsch synthesis water; and the purification can be performed according to the fine chemical engineering purity requirement.

Description

technical field [0001] The invention relates to a method for purifying and recovering Fischer-Tropsch synthetic water. Background technique [0002] Fischer-Tropsch synthesis is the conversion of synthesis gas (carbon monoxide and hydrogen) derived from natural gas, coal, etc., into normal hydrocarbons (alkanes and α-olefins) with chain lengths from C1 to C100 or more, a small amount of isomeric hydrocarbons and low carbon number containing The reaction process of oxygen organic compounds (acids, alcohols, aldehydes, ketones and esters) and water, and this reaction process is accompanied by a strong exotherm. [0003] The detailed stoichiometric relationship of the Fischer-Tropsch synthesis reaction can be expressed as: [0004] Alkanes nCO+(2n+1)H 2 =C n h 2n + 2 +nH 2 O (1-1) [0005] Alkenes nCO+2nH 2 =C n h 2n +nH 2 O (1-2) [0006] Acid nCO+(2n-2)H 2 =C n h 2n o 2 +(n-2)H 2 O (1-3) [0007] Alcohol nCO+2nH 2 =C n h 2n + 2 O+(n-1)H 2 O (1-4) [00...

AI Technical Summary

Problems solved by technology

The unit process involved in the patent includes: ordinary rectification, azeotropic rectification, extractive rectification, batch rectification, etc. There are 12 towers in the whole process, and the process is relatively complicated

Since there are many types of oxygen-containing organic substances in the actual Fischer-Tropsch synthesis water phase, their content will inevitably fluctuate during the production process, and the process introduced in the patent has high requirements for the stability of the raw material composition and the integration of the process. Therefore, it is difficult to achieve industrial scale-up

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