Novel efficient cetane number improver and preparation method thereof

Abstract

The invention discloses a preparation method of a novel efficient diesel-fuel cetane number improver, belonging to the technical field of oil refining assistants. Under the action of a catalyst, namely concentrated sulfuric acid, nitric acid and isooctyl alcohol are esterified through a mixing section and a reacting section in a tubular reactor to obtain the cetane number improver. Compared with the traditional preparation process of the cetane number improver, the preparation method disclosed by the invention has the advantages that nitric acid, sulfuric acid and isooctyl alcohol are taken as starting materials to carry out tubular reaction in the tubular reactor, and caustic soda flakes are added into the obtained product for neutralizing, drying and filtering to obtain a product with higher purity, so that the problems of potential safety hazards and low production efficiency in traditional kettle type nitration are successfully solved, the purity and yield of the product are increased, and the after-treatment of the product is simplified. After the cetane number improver is added into diesel fuel, the cetane performance of the diesel fuel can be effectively increased.

Description

technical field

[0001] The invention belongs to the technical field of novel oil refining aids, and in particular relates to a novel cetane number improver and a preparation method thereof. Background technique

[0002] The cetane number improver is a kind of oil additive that can be added to diesel oil to increase the cetane number of diesel oil and has little effect on the properties of other oil products. Selecting a cetane number improver with excellent performance is of great significance for improving diesel quality, reducing exhaust emissions, reducing fuel consumption, and increasing the output of high-standard diesel.

[0003] Adding cetane number improver to diesel can improve its ignition performance. The reaction process is: in the compression combustion stroke of the engine, the additive is thermally decomposed into a chain reaction initiator, followed by chain reaction, oxidation reaction and decomposition reaction at high temperature. Therefore, the additive...

Examples

preparation example Construction

[0022] A preparation method of a novel high-efficiency cetane number improver for diesel oil is prepared by esterification of nitric acid and isooctyl alcohol under the action of catalyst concentrated sulfuric acid in a tubular reactor through a mixing section and a reaction section.

[0023] Its preparation method is: (1) Prepare mixed acid solution, and use nitrogen protection for standby. (2) Use the raw material pump to drive the mixed acid and isooctyl alcohol into the tubular reactor at a certain flow rate ratio for reaction. (3) Layer the reacted sample, separate the water phase, add caustic soda to the organic phase to neutralize, dry and filter to obtain the product.

[0024] According to the above preparation method, the invention will be further described in conjunction with the specific examples.

Embodiment 1

[0026] A preparation method of a new type of high-efficiency diesel cetane number improver, the concentration of sulfuric acid is 83%, the concentration of nitric acid is 95-98%; the mass ratio of sulfuric acid and nitric acid in the mixed acid is 2.2:1-4.3:1; the reaction temperature in the tube Up to 70-85°C; the flow rate ratio of mixed acid and isooctyl alcohol is 0.82-1.23; the total reaction volume of the mixing section and the reaction section is 30mL, and the reaction volume ratio of the mixing section and the reaction section is 1:10. Layer the reacted sample, separate the water phase, add 40g of 95-99.5% caustic soda to the organic phase, neutralize, dry and filter to obtain the product. The product purity is 92.0%.

Embodiment 2

[0028] A preparation method of a novel high-efficiency diesel cetane number improver, the concentration of sulfuric acid is 95-98%, the concentration of nitric acid is 95-98%; the mass ratio of sulfuric acid and nitric acid in the mixed acid is 2.2:1-4.3:1; The reaction temperature reaches 70-85°C; the flow rate ratio of mixed acid to isooctyl alcohol is 0.82-1.23; the total reaction volume of the mixing section and the reaction section is 30mL, and the reaction volume ratio of the mixing section and the reaction section is 1:10. Layer the reacted sample, separate the water phase, add 10g of 95-99.5% caustic soda to the organic phase, neutralize, dry and filter to obtain the product. The product purity is 99.5%.

technical field

[0001] The invention belongs to the technical field of novel oil refining aids, and in particular relates to a novel cetane number improver and a preparation method thereof. Background technique

[0002] The cetane number improver is a kind of oil additive that can be added to diesel oil to increase the cetane number of diesel oil and has little effect on the properties of other oil products. Selecting a cetane number improver with excellent performance is of great significance for improving diesel quality, reducing exhaust emissions, reducing fuel consumption, and increasing the output of high-standard diesel.

[0003] Adding cetane number improver to diesel can improve its ignition performance. The reaction process is: in the compression combustion stroke of the engine, the additive is thermally decomposed into a chain reaction initiator, followed by chain reaction, oxidation reaction and decomposition reaction at high temperature. Therefore, the additive...

Examples

preparation example Construction

[0022] A preparation method of a novel high-efficiency cetane number improver for diesel oil is prepared by esterification of nitric acid and isooctyl alcohol under the action of catalyst concentrated sulfuric acid in a tubular reactor through a mixing section and a reaction section.

[0023] Its preparation method is: (1) Prepare mixed acid solution, and use nitrogen protection for standby. (2) Use the raw material pump to drive the mixed acid and isooctyl alcohol into the tubular reactor at a certain flow rate ratio for reaction. (3) Layer the reacted sample, separate the water phase, add caustic soda to the organic phase to neutralize, dry and filter to obtain the product.

[0024] According to the above preparation method, the invention will be further described in conjunction with the specific examples.

Embodiment 1

[0026] A preparation method of a new type of high-efficiency diesel cetane number improver, the concentration of sulfuric acid is 83%, the concentration of nitric acid is 95-98%; the mass ratio of sulfuric acid and nitric acid in the mixed acid is 2.2:1-4.3:1; the reaction temperature in the tube Up to 70-85°C; the flow rate ratio of mixed acid and isooctyl alcohol is 0.82-1.23; the total reaction volume of the mixing section and the reaction section is 30mL, and the reaction volume ratio of the mixing section and the reaction section is 1:10. Layer the reacted sample, separate the water phase, add 40g of 95-99.5% caustic soda to the organic phase, neutralize, dry and filter to obtain the product. The product purity is 92.0%.

Embodiment 2

[0028] A preparation method of a novel high-efficiency diesel cetane number improver, the concentration of sulfuric acid is 95-98%, the concentration of nitric acid is 95-98%; the mass ratio of sulfuric acid and nitric acid in the mixed acid is 2.2:1-4.3:1; The reaction temperature reaches 70-85°C; the flow rate ratio of mixed acid to isooctyl alcohol is 0.82-1.23; the total reaction volume of the mixing section and the reaction section is 30mL, and the reaction volume ratio of the mixing section and the reaction section is 1:10. Layer the reacted sample, separate the water phase, add 10g of 95-99.5% caustic soda to the organic phase, neutralize, dry and filter to obtain the product. The product purity is 99.5%.