SU115343A1 - Method for oxidizing shale concentrates - Google Patents

Description

Kukersite oil shale is being processed at the present time to produce RESIN and high-calorific gas. Its reserves are practically unlimited. In this slate there are organic substances whose concentrate is called kerogen.

The described method for the oxidation of shale concentrates makes it possible to obtain dibasic saturated ACIDS from amber to sebacinous and high-quality fertilizer.

During direct oxidation of kerogen with dilute nitric acid and air oxygen at 105-130 ° for 4-8 hours, saturated dibasic acids are formed up to 63% of the weight of the initial kerogen.

The preparation of a kukersite kerogen concentrate is not difficult and can be accomplished both by the flotation method and by separation in heavy liquids.

Oxidative processing of the kerogen of the kukersite consists of the following stages.

Oxidation of kerogen concentrate obtained by flotation or any other industrial method diluted with nitric acid in an autoclave, using an initial air pressure of 50 to 100 atm OR without it at 105-130 ° for 4-8 hours.

Separating a solution of dibasic saturated acids and vapor-volatile monobasic ACIDS from insoluble oxidation products using vacuum filters or filter presses. Insoluble oxidation products are the first return.

Neutralize the free nitric acid in the resulting solution of organic acids, ammonia or soda and re-filter to remove from the small amount of organic iron salts precipitated during this operation and, apparently, aluminum (second return).

Distillation in vacuum of water and volatile monobasic acids with steam.

Extract from a concentrated solution or dry residue of dibasic saturated acids with an organic solvent. The remainder yields a byproduct of production, ammonium phosphate, which is sold as fertilizer.

Distillation of the solvent from the final extract in vacuo. A residue is obtained in the residue - a mixture of crude dibasic acids from succinic to sebacic, inclusive.

These first and second returns are fed back to oxidation, and the same mixture of acids is formed from them. Therefore, obtaining acids from returns and their output is given by the mixture of acids as a percentage

are fed to the initial concentrate. The mineral portion of the concentrate (10-15%) gradually accumulates in. returns and periodically removed from the loop. For the time being, it is considered to be a waste of production, but in the future it may find application in other processes of the shale chemical industry, since this mineral part is mainly clay of a high degree of dispersion.

The mixture of dibasic acids resulting from the oxidative processing of kerogen has the following average component composition.

As follows from the above data, acids with a methylene content from 4 to 8 are contained in the mixture in an amount of 63%, however, from some experiments it can be seen that their content can increase to 75-80%.

Subject invention

The method of oxidizing shale concentrates characterized in that.

that, in order to obtain dibasic saturated acids from succinic to sebacic and high-quality fertilizer, the oxidation process is carried out with diluted nitric acid and oxygen from 105-130 ° C for 4-8 hours.