阅读说明：本技术 一种使气液有效分布的催化剂载体及其制备方法 (Catalyst carrier for effectively distributing gas and liquid and preparation method thereof ) 是由 姚光纯 黄林 李付林 于 2020-12-08 设计创作，主要内容包括：本发明公开一种使气液有效分布的催化剂载体,其具有圆柱状本体,所述圆柱状本体的两端设有贯穿其两端面的多个三角孔或方形孔；该载体的制备原料包括主料和添加剂,所述主料为拟薄水铝石、大孔氢氧化铝、活性氧化铝或分子筛中的一种或多种；所述添加剂占总原料重量的0-10%；制备过程包括混料、捏合、练泥、陈腐、成型、烘干、焙烧；本发明使用活性氧化铝做为原料,浸渍后与活性孔型结合,提高催化反应的活性；在稳定散堆时,使得90%以上的气液通过催化剂载体,提高催化活性。(The invention discloses a catalyst carrier for effectively distributing gas and liquid, which is provided with a cylindrical body, wherein two ends of the cylindrical body are provided with a plurality of triangular holes or square holes penetrating through two end faces of the cylindrical body; the preparation raw materials of the carrier comprise main materials and additives, wherein the main materials are one or more of pseudo-boehmite, macroporous aluminum hydroxide, activated alumina or molecular sieves; the additive accounts for 0-10% of the total weight of the raw materials; the preparation process comprises mixing, kneading, pugging, aging, molding, drying and roasting; the invention uses active alumina as raw material, which is combined with active hole pattern after dipping, to improve the activity of catalytic reaction; when the reactor is stably scattered, more than 90% of gas-liquid passes through the catalyst carrier, so that the catalytic activity is improved.)

1. The catalyst carrier capable of effectively distributing gas and liquid is characterized by comprising a cylindrical body, wherein two ends of the cylindrical body are provided with a plurality of triangular holes or square holes penetrating through two end faces of the cylindrical body.

2. The catalyst carrier for effecting distribution of gas-liquid as recited in claim 1, wherein said cylindrical body has a diameter of 10-12mm, a height of 2-6.5mm and a wall thickness of 0.6-0.8mm, and said triangular holes have a wall thickness of 0.5-0.7mm and a mesh number of 350-500 mesh.

3. The catalyst carrier for effecting distribution of gas-liquid as recited in claim 1, wherein said cylindrical body has a diameter of 8 to 10mm, a height of 2 to 5mm, a wall thickness of 0.5 to 0.7mm, a wall thickness of 0.45 to 0.65mm and a mesh number of 400-600 mesh.

4. The catalyst carrier for effecting distribution of gas-liquid as recited in claim 1, wherein said cylindrical body has a diameter of 6 to 8mm, a height of 2 to 4.5mm and a wall thickness of 0.4 to 0.6mm, and said triangular holes have a wall thickness of 0.35 to 0.6mm and a mesh number of 500-800 mesh.

5. The catalyst carrier for effecting distribution of gas-liquid as recited in claim 1, wherein said cylindrical body has a diameter of 4 to 6mm, a height of 2 to 4mm and a wall thickness of 0.4 to 0.6mm, and said triangular holes have a wall thickness of 0.1 to 0.6mm and a mesh number of 500-1200 mesh.

6. The catalyst carrier for effectively distributing gas and liquid as recited in claim 1, wherein said cylindrical body has a diameter of 10-12mm, a height of 2-8mm, a wall thickness of 0.6-0.8mm, a wall thickness of 0.25-0.45mm, and a mesh number of 300-600 mesh.

7. The preparation method of the catalyst carrier for effectively distributing gas and liquid is characterized in that the preparation raw materials of the carrier comprise main materials and additives, wherein the main materials are one or more of pseudo-boehmite, macroporous aluminum hydroxide, activated alumina or a molecular sieve; the additive accounts for 0-10% of the total weight of the raw materials; the preparation process comprises the steps of mixing, kneading, pugging, ageing, molding, drying and roasting.

8. The method for producing a catalyst carrier effective for gas-liquid distribution according to claim 7, wherein the additive comprises cellulose and sesbania powder; the additive accounts for 1-5% of the total raw materials.

9. The method for producing a catalyst carrier having an effect of distributing gas-liquid according to claim 7, wherein nitric acid is added in an amount of 0 to 5% by weight based on the total raw material and rape oil is added in an amount of 0 to 5% by weight based on the total raw material during the kneading process.

10. The method for preparing a catalyst carrier having an effective gas-liquid distribution according to claim 7, wherein the aging temperature is 30 to 50 ℃ and the aging humidity is 40 to 70%; the roasting temperature is 500-900 ℃.

Technical Field

The invention relates to the technical field of catalyst carriers, in particular to a catalyst carrier capable of effectively distributing gas and liquid and a preparation method thereof.

Background

With the continuous development of the chemical industry, the industry puts higher and higher technical requirements on chemical reactions, and particularly in catalytic reactions, the catalytic reactions are expected to have stronger selectivity and better catalytic activity.

At present, the shapes of catalyst carriers mainly comprise strip, hollow cylinder and clover. The minimum dimension of the solid shape is 1-1.1mm under the requirement of pressure drop, while the minimum dimension of the hollow product is 3-4mm due to the limitation of strength. The pressure drop of the bed layer has a relation with the size and the shape of the particles, and the smaller the particles, the larger the pressure drop. However, the results are reversed from the viewpoint of catalyst activity.

Under the condition that the total amount of active metal materials and the shape of a carrier are not changed, taking a 1.1mm catalyst as a sample, and setting the activity factor of the catalyst to be 1; according to research data, the catalyst activity factor of 0.7-0.9mm is 4, the catalyst activity factor of 0.2-0.5mm is 14, and the catalytic activity increases with the reduction of the size. The use of a catalyst with smaller particles can reduce the influence of internal diffusion, and is beneficial to improving the surface utilization rate of the catalyst, thereby improving the activity of the catalyst.

The smaller the particle, the greater the pressure drop and the opposite the catalytic activity, which are two contradictory aspects and are why the shape of the catalyst is not changed at present.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects of the prior art: the preparation method comprises the steps of designing the formula of a carrier material and parameters such as diameter, height, rib thickness, wall thickness, mesh number and the like to obtain a carrier with high specific surface area, using active alumina as a raw material, and combining the impregnated active alumina with an active hole pattern to improve the activity of catalytic reaction; when the reactor is stably scattered, more than 90% of gas-liquid passes through the catalyst carrier, so that the catalytic activity is improved.

The technical scheme of the invention is as follows: a catalyst carrier has a cylindrical body, and a plurality of triangular holes or square holes penetrating through two end faces of the cylindrical body are arranged at two ends of the cylindrical body.

Preferably, the diameter of the cylindrical body is 10-12mm, the height is 2-6.5mm, the wall thickness is 0.6-0.8mm, the wall thickness of the triangular hole is 0.5-0.7mm, and the mesh number is 350-500 meshes.

Preferably, the diameter of the cylindrical body is 8-10mm, the height is 2-5mm, the wall thickness is 0.5-0.7mm, the wall thickness of the triangular hole is 0.45-0.65mm, and the mesh number is 400-600 meshes.

Preferably, the diameter of the cylindrical body is 6-8mm, the height is 2-4.5mm, the wall thickness is 0.4-0.6mm, the wall thickness of the triangular hole is 0.35-0.6mm, and the mesh number is 500-800 meshes.

Preferably, the diameter of the cylindrical body is 4-6mm, the height is 2-4mm, the wall thickness is 0.4-0.6mm, the wall thickness of the triangular hole is 0.1-0.6mm, and the mesh number is 500-1200 meshes.

Preferably, the diameter of the cylindrical body is 2-4mm, the height is 1-4mm, the wall thickness is 0.4-0.6mm, the wall thickness of the triangular hole is 0.1-0.5mm, and the mesh number is 650-950 meshes.

Preferably, the diameter of the cylindrical body is 10-12mm, the height is 2-8mm, the wall thickness is 0.6-0.8mm, the wall thickness of the square hole is 0.25-0.45mm, and the mesh number is 300-600 meshes.

Preferably, the diameter of the cylindrical body is 8-10mm, the height is 2-8mm, the wall thickness is 0.5-0.7mm, the wall thickness of the square hole is 0.25-0.4mm, and the mesh number is 400-900 meshes.

Preferably, the diameter of the cylindrical body is 6-8mm, the height is 2-8mm, the wall thickness is 0.4-0.6mm, the wall thickness of the square hole is 0.1-0.35mm, and the mesh number is 500-1000 meshes.

Preferably, the diameter of the cylindrical body is 4-6mm, the height is 1-6mm, the wall thickness is 0.4-0.6mm, the wall thickness of the square hole is 0.05-0.25mm, and the mesh number is 600-1400 meshes.

The invention also provides a preparation method of the catalyst carrier, the preparation raw materials of the carrier comprise main materials and additives, and the main materials are one or more of pseudo-boehmite, macroporous aluminum hydroxide, activated alumina or molecular sieve; the additive accounts for 0-10% of the total weight of the raw materials; the preparation process comprises the steps of mixing, kneading, pugging, ageing, molding, drying and roasting.

Preferably, the additive accounts for 1-5% of the total raw materials.

Preferably, the additives include cellulose and sesbania powder.

Preferably, nitric acid accounting for 0-5% of the total raw material weight and rape oil accounting for 0-5% of the total raw material weight are added during the kneading process.

Preferably, the ageing temperature is 30-50 ℃, the ageing humidity is 40-70%, the temperature is set to be the same as the temperature of the pug, the temperature difference between the pug and the environment is reduced, and the ageing effect is better.

The roasting temperature is 500-900 ℃, and the alumina with the gamma or delta crystal orientation is obtained.

The invention has the beneficial effects that: the invention adjusts the parameters of the diameter, the rib thickness, the wall thickness and the like of the carrier to obtain the fixed ratio of the gaps among the particles to the gaps inside the particles, so that more than 90% of the gas and liquid of the raw materials can pass through the inside of the particles, and the surface utilization rate and the activity of the catalyst are improved under the condition of not influencing the pressure drop. The structural design of the invention can ensure that gas and liquid are uniformly distributed.

Drawings

Fig. 1 is a sectional view of a triangular-hole catalyst carrier.

FIG. 2 is a diagram showing a particle packing pattern in triangular holes.

Fig. 3 is a sectional view of a square-hole catalyst carrier.

FIG. 4 is a diagram of a square-hole particle packing.

Detailed Description

The present invention will be described in further detail with reference to the following examples, but the present invention is not limited to the following examples.

Structural design of carrier

As shown in FIG. 1, the carrier of this embodiment is a cylinder, the diameter of the finished cylinder is 11mm, the height is 6.5mm, the wall thickness is 0.6mm, the wall thickness of the triangular hole is 0.6mm, and the mesh number is 400.

As shown in FIG. 3, the carrier of this embodiment is a cylinder, the diameter of the finished cylinder is 11mm, the height is 7mm, the wall thickness is 0.7mm, the wall thickness of the square hole is 0.4mm, and the mesh number is 300.

The process for preparing the carrier specifically comprises the following steps:

(1) firstly, uniformly mixing the following components in proportion: 48 parts of pseudo-boehmite, 48 parts of macroporous aluminum hydroxide, 2 parts of cellulose and 2 parts of sesbania powder;

(2) putting the uniformly mixed raw materials into a kneader, and adding a mixed solution, wherein the addition amount of the mixed solution is 80% of the total weight of the raw materials, and the mixed solution comprises the following components in percentage by mass: 2% of rape oil, 3% of nitric acid and the balance of water;

(3) adding the mixed solution, kneading for 8 minutes, and then loading the pug into a pug mill for pugging;

(4) wrapping and sealing pug after pugging by using a winding film, and putting the pug into a device capable of adjusting temperature and humidity for ageing, wherein the temperature is set to be 35 ℃ and the humidity is 60%;

(5) after 24 hours, taking out the pug, and placing the pug in a press for molding;

(6) the product is placed in a device capable of adjusting the temperature and the humidity and is dried to 35-80 ℃;

(7) and roasting the dried product at 700 ℃ for 3 hours to obtain the carrier.

The above are merely characteristic embodiments of the present invention, and do not limit the scope of the present invention in any way. All technical solutions formed by equivalent exchanges or equivalent substitutions fall within the protection scope of the present invention.