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Preparation method of solid phosphoric acid catalyst, vibration-type fine powder directional feeder used in the method and application thereof

A phosphoric acid catalyst and feeder technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, feeding devices, etc., can solve the problems of difficult water removal, low contact probability, poor dispersion, etc., to improve activity and mud resistance Chemical performance, ensuring dispersion uniformity, and improving the reaction rate

Active Publication Date: 2018-06-08
RACHEM CHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used traditional manual feeding method is to manually use a spoon to add from the feeding port. The disadvantages include: because the salt formation is an exothermic reaction, the adding speed is adjusted according to the temperature of the material in the reactor.
With this feeding method based on the spoon, the dispersibility of the reaction material is extremely poor, and there must be agglomeration of boric acid falling into the liquid surface, and excessive local heat release, see figure 1 ; Feeding speed and uniformity are difficult to control; and will produce a lot of dust, high ambient temperature, long-term operation, a threat to the physical and mental health of operators
[0007] In the prior art, the problems existing when powdered boric acid and niobic acid are added to polyphosphoric acid liquid and react with each other include: polyphosphoric acid has a viscosity as high as 35,000 centipoise and a density of 2.1 g / cm at a reaction temperature of 220°C. 3 , while the true density of boric acid is 1.435g / cm 3 Therefore, the boric acid put into the reactor floats on the surface of the polyphosphoric acid liquid layer, and it is difficult to enter the interior of the polyphosphoric acid liquid phase.
[0008] At present, the production technology of domestic solid phosphoric acid catalyst is not yet mature, and it is urgent to build industrial production technology and equipment with independent intellectual property rights

Method used

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  • Preparation method of solid phosphoric acid catalyst, vibration-type fine powder directional feeder used in the method and application thereof
  • Preparation method of solid phosphoric acid catalyst, vibration-type fine powder directional feeder used in the method and application thereof
  • Preparation method of solid phosphoric acid catalyst, vibration-type fine powder directional feeder used in the method and application thereof

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preparation example Construction

[0056] The preparation method of the solid phosphoric acid catalyst of the present invention includes: boron phosphate and borophosphoric acid formation reaction, followed by heating and kneading, homogenization, molding, drying and other processes to obtain a catalyst precursor with a diameter of 3 mm to 7 mm, followed by roasting and molding processes , activation and "pre-attrition" process to obtain the finished solid phosphoric acid catalyst.

[0057] In step (1), the above-mentioned boron phosphate and phosphoric borate generation reaction process adopts a vibratory fine powder quantitative feeder, which feeder includes a hopper, an upper feed bin, a screen (for example, an 80-mesh sieve at the bottom of the upper feed bin net) and its supporting plate, sliding brush parts on the upper part of the screen, sliding brush drive motors and guide rails, lower hoppers, and vibrating parts.

[0058] In step (1), the above-mentioned boron phosphate and boron phosphate generating...

Embodiment 1

[0059] Example 1 Preparation of solid phosphoric acid catalyst (SPAC-1)

[0060] In the present embodiment, the preparation process of solid phosphoric acid catalyst (SPAC-1):

[0061] (1) The reaction of adding materials and generating boron phosphate: when the temperature of the reactor jacket reaches about 90°C, start stirring, add a specified amount of preheated polyphosphoric acid, continue to heat up, and reach 180°C in about 1 hour, start the oscillating fine Divide the directional feeder, adjust to a suitable feeding speed (for example, 1.0 kg / min), start adding a specified amount of boride, the reaction of generating boron phosphate is a moderately exothermic confrontation reaction, the temperature rises, and when it reaches 200 ° C, shut down The reactor jacket is electrically heated, and the temperature of the heat carrier is adjusted to keep the reaction temperature at 220°C. The water produced by the reaction must be removed from the system in time, so that the re...

Embodiment 2

[0070] Example 2 Preparation of solid phosphoric acid catalyst (SPAC-2)

[0071] (1) The reaction of adding materials and generating boron phosphate: when the temperature of the jacket of the reactor reaches about 80°C, start stirring, add a specified amount of preheated polyphosphoric acid, continue to heat up, and reach 180°C in about 1 hour, start the oscillating fine Directional feeder, set feed rate 1.1 kg / min), start to add a specified amount of boride, the reaction of generating boron phosphate is a moderate exothermic confrontation reaction, the temperature rises, when it reaches 200 ° C, close the reactor jacket electric Heating, adjusting the temperature of the heat carrier to keep the reaction temperature at 210°C, the water produced by the reaction must be removed from the system in time, so that the reaction continues to the right, and the reaction is kept for 1 hour.

[0072](2) For the reaction of forming niobium phosphoborate, maintain a temperature of about 21...

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Abstract

The invention relates to a preparation method of a solid phosphoric acid catalyst. The preparation method of the solid phosphoric acid catalyst comprises the steps of salt-forming reaction of niobium boron phosphate compound salt, forming of the solid phosphoric acid catalyst, and the like, so that the solid phosphoric acid catalyst is obtained. The invention further discloses a vibration type directional fine powder feeder and a feeding method of the feeder; the feeder and the feeding method are applied to the preparation method of the solid phosphoric acid catalyst. According to the preparation method of the solid phosphoric acid catalyst, the vibration type directional fine powder feeder applied to the preparation method as well as the application of the feeder, the production cost is reduced, and both the activity and the degradation in water of the solid phosphoric acid catalyst are improved, so that the solid phosphoric acid catalyst can be widely applied to large-scale industrial production.

Description

technical field [0001] The invention relates to the technical field of solid phosphoric acid catalyst preparation, in particular to a preparation method of a solid phosphoric acid catalyst, and an oscillating fine powder directional feeder and a feeding method used in the preparation method. Background technique [0002] my country has abundant sources of raw materials for oligomerization, and oil refineries and petrochemical plants co-produce a large amount of low-carbon olefins (propylene and butene). In 2005, my country's C 4 The total yield of fractions exceeds 6×10 7 t; 2010c 4 The total yield of distillates reaches 9.7×10 7 t is an abundant butene oligomerization raw material; in addition, the liquefied gas separated from oil and gas fields is mainly C 4 ; In recent years, a large amount of liquefied gas has been imported in China. In addition to being used as fuel, the contained C 4 Alkanes, after dehydrogenation, are also excellent raw materials for oligomerizati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/195B01J4/00
Inventor 李海娟刘新海
Owner RACHEM CHINA CO LTD
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