Titanium-silicon molecular sieve catalyst, preparation method thereof and application thereof in production of propylene oxide

A technology of titanium-silicon molecular sieve and propylene oxide, which is applied in the direction of molecular sieve catalysts, bulk chemical production, chemical instruments and methods, etc., can solve the problems of large fluctuations in market demand for by-products, high explosion-proof grades, and short processes, and achieve savings Effects of dehydration process, prolonging service life and improving productivity

Inactive Publication Date: 2017-08-04
江苏道尔顿石化科技有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The co-oxidation method overcomes the shortcomings of the chlorohydrin method, such as serious waste pollution, large equipment corrosion, and the need for chlorine as a raw material, but it has high requirements for raw material specifications, long process, high explosion-proof grade, high investment cost, and a large amount of by-product styrene , tert-butanol output, and the market demand for by-products fluctuates greatly
[0005] In this regard, companies such as BASF and Dow have successively developed green single-yield propylene oxide-hydrogen peroxide production technologies, using propylene and hydrogen peroxide as raw materials, methanol as a solvent, and the materials are reacted in a fixed-bed reactor at relatively low temperature and low pressure , the products are only propylene oxide and water, and the unreacted propylene can be recycled. It has the advantages of short process, high product yield, and single production of propylene oxide. The process is clean, but the disadvantage is that it needs to be equipped with a high-concentration hydrogen peroxide device. Potential safety hazards, high device operating costs

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  • Titanium-silicon molecular sieve catalyst, preparation method thereof and application thereof in production of propylene oxide
  • Titanium-silicon molecular sieve catalyst, preparation method thereof and application thereof in production of propylene oxide

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preparation example Construction

[0049] The preparation process of the titanium-silicon molecular sieve catalyst is as follows: under normal pressure, 1g of all-silicon molecular sieve carrier powder is purged at 500°C for 0.3h under a nitrogen heat flow of 200ml / min to remove moisture, and then the temperature is rapidly raised to 850°C, and the temperature difference is controlled during the heating process. within ±1°C. In the vacuum evaporator, TiCl 4 It sublimes into a gas at 850°C. Under the protection of nitrogen flow, add to the SiO 2 In the reactor of the carrier, the nitrogen flow rate is controlled to be 100ml / min, and TiCl is continuously fed into the quartz tube reactor equipped with the carrier. 4 , allowing the particles to settle freely on the surface of the molecular sieve carrier. When the loading phase is over, use 400°C, 100ml / min dry nitrogen flow to continue purging for 1h to remove the remaining TiCl inside the reactor 4 Steam, followed by continuous calcination at 500-600°C for 3h ...

Embodiment 1

[0058] Weigh 2g of the titanium-silicon molecular sieve catalyst prepared by the above method with a particle size of 0.3-0.6mm, and fill it in a 304L stainless steel fixed-bed reactor with an inner diameter of 15mm. It is 36kg. The mass fraction of CHP is 40%, and the remaining solvent is cumene. Propylene is fed into the reactor by pumping the liquid phase. During the reaction, the amount of propylene is excessive, and the total mass space velocity in the fixed bed is controlled to be 6h -1 , The end of the device is equipped with a gas-liquid separation tank, the separation tank is cooled by chilled water, the material is collected every ten minutes, samples are taken, and the product composition is analyzed by gas chromatography. The calculated conversion rate C of CHP CHP =91.4%, PO yield P PO =84.2%, CHP selectivity S PO =92.1%, the mass fraction of water shown in the moisture meter is 3.7%. From the above data, it can be seen that by precisely controlling the confi...

Embodiment 2

[0060] Reaction temperature is 90 DEG C, continuous reaction 0.5h, other conditions are the same as embodiment 1, collect material and carry out chromatographic detection, the conversion rate of CHP is C CHP =93.2%, PO yield P PO =86.3%, CHP selectivity S PO = 92.5%.

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Abstract

The invention discloses a titanium-silicon molecular sieve catalyst, a preparation method thereof and application thereof in the production of propylene oxide. Titanium in the titanium-silicon molecular sieve catalyst of the invention has mass fraction of 0.5-5%, particle size of 0.5-10 nm, specific surface area of 50-500 m<2>, particle size of 0.3-0.6 mm and bulk density of 0.1-0.6 g / cm<3>. The particles of the titanium-silicon molecular sieve catalyst are rarely break and have high activity. The titanium-silicon molecular sieve catalyst prepared herein breaks rarely; by applying the titanium-silicon molecular sieve catalyst to the production of propylene oxide, high activity is exhibited, the yield of propylene oxide can be increased, the procedure of equipment is simplified, and equipment investment is 1 / 3 lower than oxidation process in terms of investment cost.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to a titanium-silicon molecular sieve catalyst, a preparation method and its application in the production of propylene oxide. Background technique [0002] Propylene oxide is an important basic chemical raw material, mainly used in the production of polyether polyol, propylene glycol, isopropanolamine, propylene carbonate and other products, and is widely used in the fields of paint, food, tobacco, medicine and cosmetics. [0003] At present, the production process of 70% of propylene oxide in my country is the traditional chlorohydrin method, which is characterized by mature process, simple operation, short process, large operation flexibility, and low requirements for the purity of raw material propylene. However, a large amount of waste water and waste residue will be produced in the production process of the chlorohydrin method, and 40-50 tons of chloride-containing saponificat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/89C07D301/19C07D303/04
CPCY02P20/52B01J29/89C07D301/19C07D303/04
Inventor 叶子茂姜博文王大文
Owner 江苏道尔顿石化科技有限公司
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