CN204958826U - A reactor for alkylate is synthetic - Google Patents

Abstract

The utility model discloses a reactor for synthesizing alkylated oil. The cylinder body of the reactor is composed of a straight cylinder section, a wide diameter section and a transition section between the straight cylinder section and the wide diameter section, and the lower part of the straight cylinder section is provided with The lower tube sheet of the inner tube, the lower tube sheet of the outer tube is arranged above the lower tube sheet of the inner tube, and the upper tube sheet is arranged at the junction of the straight tube section and the transition section; the upper end and the lower end of the downcomer are connected with the upper tube sheet and the outer tube sheet Tube-bottom tube-sheet connection, the upper and lower ends of the outer tube are connected to the upper tube-sheet and the lower tube-sheet of the outer tube respectively, the inner tube is set inside the outer tube, the upper end of the inner tube is a blind end, and the lower end of the inner tube is connected to the lower tube-sheet of the inner tube , the inner tube is provided with holes. Compared with existing industrial reactors, the acid-hydrocarbon contact effect is better, the reaction rate is accelerated, the size of the reactor is reduced, and the alkene ratio is reduced at the same time, and the reaction temperature can be strictly controlled to reduce the generation of reaction by-products, thereby increasing the alkyl The output and quality of synthetic oil can be improved, and the energy consumption required for the isobutane cycle can be reduced.

Description

A reactor for the synthesis of alkylate oil

technical field

The utility model relates to chemical equipment, in particular to a reactor for synthesis of alkylated oil.

Background technique

The industrial isooctane produced by the alkylation reaction of C4 olefins and isobutane is a blending component of high-octane gasoline with various trimethylpentane as the main component. Industrial isooctane has a high octane number and combustion The advantages of less harmful products and lower vapor pressure. Alkylation reaction can be divided into sulfuric acid alkylation process and hydrofluoric acid alkylation process according to the different catalysts used. Hydrofluoric acid is a volatile and highly toxic chemical. Once leaked, it will cause serious harm to the environment and production. The main disadvantage of the sulfuric acid alkylation process is the large discharge of waste acid. The sulfuric acid alkylation process is mostly used in our country. It is generally believed that the controlling step that determines the reaction rate of the sulfuric acid alkylation process is the mass transfer of alkane to the acid. Therefore, the contact of acid hydrocarbons in the sulfuric acid alkylation process is an extremely important operational variable. At present, two main sulfuric acid alkylation processes are the effluent refrigeration type sulfuric acid alkylation reaction process of Stratco Company of the United States and the step reactor sulfuric acid alkylation process of Kellogg Company of the United States. The degree of acid hydrocarbon exposure greatly limits the reaction rate and increases the reactor size. In addition, the sulfuric acid alkylation process is still a strong exothermic reaction, and the increase in reaction temperature will increase the by-products and affect the quality of alkylated oil.

Utility model content

The purpose of the utility model is to provide a reactor for the synthesis of alkylated oil which can solve the problem of acid hydrocarbon contact and reaction heat release in the sulfuric acid alkylation process.

The technical scheme of the utility model is summarized as follows:

A reactor for the synthesis of alkylated oil, comprising a reactor barrel 1, the reactor barrel is composed of a straight barrel section 2, a wide diameter section 19 and a transition section 5 between the straight barrel section and the wide diameter section, the wide diameter section The upper end of the diameter section is connected with an upper head 6, the lower end of the straight section is connected with a lower head 15, the lower part of the straight section is provided with an inner tube lower tube sheet 14, and the lower part of the straight section and above the inner tube lower tube sheet is provided with an outer tube The lower tube sheet 13 is provided with an upper tube sheet 4 at the junction of the straight tube section and the transition section; the upper and lower ends of the downcomer 9 are respectively connected with the upper tube sheet and the lower tube sheet of the outer tube, and the diameter is smaller than that of the outer tube of the downcomer 10 is arranged between the downcomer and the inner surface of the straight section, and the upper and lower ends of the outer tube are respectively connected with the upper tube sheet and the lower tube sheet of the outer tube. The upper middle part of the inner tube 11 is arranged inside the outer tube, and the upper end of the inner tube is a end, the lower end of the inner tube is connected with the lower tube plate of the inner tube, the inner tube is provided with a hole, the top of the inner tube is located between the upper tube plate and the lower tube plate of the outer tube, inside the straight section, outside the downcomer and the outer tube A deflection baffle 18 is provided, a first feed port 16 is provided on the lower head, and a second feed port 17 is provided on the straight tube section between the lower tube sheet of the inner tube and the lower tube sheet of the outer tube. The radial section is provided with a discharge port 7, the transition section is provided with a waste acid discharge port 8, the upper part of the straight section is provided with a cooling medium outlet 3, and the lower part of the straight section is provided with a cooling medium inlet 12 above the lower tube sheet.

The outer tube 10 is a smooth tube or a finned tube or a helical tube.

Fillers can also be arranged inside the outer tube and outside the inner tube.

The utility model has the advantages that: compared with the existing industrial reactors, the acid hydrocarbon contact effect is better, the reaction rate is accelerated, the size of the reactor is reduced, and the alkene ratio is reduced at the same time, and the reaction temperature can be strictly controlled to reduce reaction by-products The production of alkylated synthetic oil can improve the production and quality of alkylated synthetic oil, and can reduce the energy consumption required for isobutane cycle.

Description of drawings:

Figure 1 is a schematic diagram of a reactor for alkylate synthesis.

detailed description

Below in conjunction with accompanying drawing, the utility model is further described. The following description is to enable those skilled in the art to better understand the utility model, but does not limit the utility model in any way.

A reactor for the synthesis of alkylated oil, comprising a reactor barrel 1, the reactor barrel is composed of a straight barrel section 2, a wide diameter section 19 and a transition section 5 between the straight barrel section and the wide diameter section, the wide diameter section The upper end of the diameter section is connected with an upper head 6, the lower end of the straight section is connected with a lower head 15, the lower part of the straight section is provided with an inner tube lower tube sheet 14, and the lower part of the straight section and above the inner tube lower tube sheet is provided with an outer tube The lower tube sheet 13 is provided with an upper tube sheet 4 at the junction of the straight tube section and the transition section; the upper and lower ends of the downcomer 9 are respectively connected with the upper tube sheet and the lower tube sheet of the outer tube, and the diameter is smaller than that of the outer tube of the downcomer 10 is arranged between the downcomer and the inner surface of the straight section, and the upper and lower ends of the outer tube are respectively connected with the upper tube sheet and the lower tube sheet of the outer tube. The upper middle part of the inner tube 11 is arranged inside the outer tube, and the upper end of the inner tube is a end, the lower end of the inner tube is connected with the lower tube plate of the inner tube, the inner tube is provided with a hole, the top of the inner tube is located between the upper tube plate and the lower tube plate of the outer tube, inside the straight section, outside the downcomer and the outer tube A deflection baffle 18 is provided, a first feed port 16 is provided on the lower head, and a second feed port 17 is provided on the straight tube section between the lower tube sheet of the inner tube and the lower tube sheet of the outer tube. The radial section is provided with a discharge port 7, the transition section is provided with a waste acid discharge port 8, the upper part of the straight section is provided with a cooling medium outlet 3, and the lower part of the straight section is provided with a cooling medium inlet 12 above the lower tube sheet.

The outer tube 10 is a smooth tube or a finned tube or a helical tube.

The space inside the outer tube and outside the inner tube can also be provided with packing, the type of packing is preferred: Pall ring packing or saddle ring packing, and other commonly used packing can also be selected.

Example 1

The alkylation oil synthesis reaction is carried out with the reactor for the synthesis of alkylation oil of the utility model, and a small-scale experimental device is adopted. The diameter of the straight cylinder section is 80mm, and the height is 1600mm.

The diameter of the wide diameter section is 200mm and the height is 500mm.

The height of the transition section is 150mm.

1 downcomer, downcomer diameter 14mm, length 1500mm,

3 outer tubes, the diameter of the outer tube is 9mm, the tube length is 1500mm, it is a smooth tube;

3 inner tubes, the inner tube diameter is 5mm, the tube length is 700mm,

The distance between the lower tube sheet of the inner tube and the lower tube sheet of the outer tube is 100 mm, and no filler is set in the space inside the outer tube and outside the inner tube.

Small holes are uniformly arranged on the inner tube throughout the axial length, with a diameter of 0.5mm.

98% concentrated sulfuric acid enters the outer pipe and downcomer from the second feed port at 6°C. At the beginning, enough 98% concentrated sulfuric acid needs to be added to fill the entire outer pipe and downcomer. 1L/h, to ensure that the concentration of concentrated sulfuric acid in the reactor is maintained at 95%; the mixture of isobutane and isobutene enters the inner tube from the first feed port at 6°C, and the volume ratio of isobutane and isobutene is 6:1. The flow rate is 30L/h, the feed pressure is 0.5MPaG (gauge pressure); frozen brine is used as the cooling medium, and the circulating frozen brine enters from the inlet of the cooling medium at 0°C and exits from the outlet of the cooling medium. is 5°C. The reaction product and unreacted isobutane come out from the outlet at a temperature of 6°C. By sampling and analyzing the reaction product at the discharge port, the conversion rate of isobutene is over 96%, the mass fraction of isooctane in the reaction product is over 28%, and the octane value of the reaction product is about 96. The experimental results show that for alkyl The reactor for carburetion synthesis has achieved good results in the synthesis of alkylate.

Claims (3)

1. A reactor for the synthesis of alkylated oils, comprising a reactor cylinder (1), the reactor cylinder consists of a straight cylinder section (2), a wide diameter section (19) and is positioned between the straight cylinder section and the wide diameter section The upper end of the wide-diameter section is connected with an upper head (6), the lower end of the straight section is connected with a lower head (15), and the lower part of the straight section is provided with an inner tube lower tube plate (14). , the lower tube plate (13) of the outer tube is arranged on the lower part of the straight tube section and above the lower tube plate of the inner tube, and the upper tube plate (4) is arranged at the junction of the straight tube section and the transition section; the upper end of the downcomer (9) and The lower ends are respectively connected to the upper tube sheet and the lower tube sheet of the outer tube, and the outer tube (10) with a diameter smaller than the downcomer is arranged between the downcomer and the inner surface of the straight section, and the upper and lower ends of the outer tube are respectively connected to the upper tube sheet and the outer tube sheet. The upper and middle parts of the inner tube (11) are arranged inside the outer tube, the upper end of the inner tube is a blind end, the lower end of the inner tube is connected with the lower tube plate of the inner tube, and holes are arranged on the inner tube. The top is located between the upper tube sheet and the lower tube sheet of the outer tube, baffles (18) are set inside the straight section, outside the downcomer and the outer tube, and the first feed port (16) is set on the lower head , a second feed inlet (17) is provided on the straight section between the lower tube sheet of the inner tube and the lower tube sheet of the outer tube, a discharge port (7) is provided at the wide diameter section, and a waste acid is provided at the transition section The outlet (8) is provided with a cooling medium outlet (3) on the upper part of the straight tube section, and a cooling medium inlet (12) is provided above the lower tube sheet of the lower outer tube of the straight tube section. 2. A reactor for synthesis of alkylate oil according to claim 1, characterized in that the outer tube (10) is a smooth tube or a finned tube or a spiral tube. 3. A reactor for synthesis of alkylated oil according to claim 1, wherein fillers are arranged inside the outer tube and outside the inner tube.