SU423490A1 - METHOD FOR REGULATING MANGANESE CATALYST - Google Patents

Description

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The present invention relates to a method for regenerating catalysts used in the refining and petrochemical industries for the oxidation of paraffins to synthetic fatty acids.

There is a method for regenerating a manganese catalyst for the oxidation of paraffins to synthetic fatty acids from sludge waters by neutralizing them with a solution of soda ash and alkali treatment.

However, with the implementation of the known method in the industry, low margarica concentration in the sludge water leads to the need to process large quantities of water and, consequently, to the consumption of energy; there are difficulties associated with the operation of separating the manganese carbonate sludge from large volumes of water; it is necessary to use sulfuric acid, which complicates and increases the cost of technology; in addition, there is an incomplete use and significant losses (about 90%) of the catalyst catalyst components contained in the mother liquor.

The purpose of the invention is to simplify the process technology, regenerate the catalyst and reduce material costs.

This goal of the proposed method is achieved by the fact that the slurry water is pre-concentrated before neutralization

by their repeated use for washing the oxidate. and then mixed with manganese sulphate.

The proposed manganese catalyst regeneration removal method makes it possible to release acidic water and replace it with concentrated slag water, eliminate the use of sulfuric acid, reduce the consumption of manganese sulphate, carbon dioxide, electricity and, in addition, significantly reduce the amount of wastewater.

The catalyst was regenerated as follows.

Pre-co-center the sludge water through multiple

NX USE for npONiblBKH new KO, 1 Quality of oxidate. Next, the slurry waters are treated with a solution of calcined soda (so that manganese carbonate does not form a precipitate), and then mixed with the required amount of the technical solution of manganese sulphate and treated with the alkali by known technology.

PR n Mer. Oxidate obtained by the catalytic oxidation of paraffin is discharged into the sludge settler. where washed with water at the rate of 10% of the load. After settling for 45 minutes, the slurry water is again fed to the irrigation of the unwashed oxndate next time.

sludge pit. This operation is repeated 4 times.

The concentrated slurry waters are treated with a solution of soda ash to neutralize the water-soluble organic acids contained therein. In a neutralized solution, 4.3% of manganese and 4.8% of sodium salts of low molecular weight acids in terms of sodium were potentiometric.

To prepare a catalyst for 10 oxidation operations, 3280 kg of neutralized sludge water are taken and mixed with 2020 kg of a technical solution of manganese sulphate containing manganese 8%, then treated with 40% alkali solution to an excess of 0.2-0.5%.

A mixture of paraffin and unstable compounds was oxidized on the obtained catalyst under industrial conditions. , and the qualitative characteristics of the oxidative oxidant and fatty acids obtained are given in the table (experiment 4 was carried out on a known catalyst for comparison).

Table

As can be seen from the table, the qualitative indicators of oxidate and selected fatty acids on the regenerated and initial catalysts are approximately the same.

Subject invention

A method for regenerating a manganese catalyst for the oxidation of paraffins to synthetic

acids from slurry waters by neutralizing them with a solution of soda ash and

by alkali treatment, in order to simplify the technology and reduce the consumption of materials, the sludge water is pre-concentrated by repeated use until its neutralization

for washing the oxidate, and then mixed with manganese sulphate.