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Para-xylene crystallization technology

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Butadiene Production Technology (RHBD)

Ruihua's technology for butadiene production by oxygen-enriched dehydrogenation of butenes uses different feeding methods and different feed compositions to solve the blockage of the second-stage reactor of the traditional oxidative dehydrogenation process and extend the catalyst operation cycle. Due to the change of the feed composition, the energy consumption of the entire device is greatly reduced.

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1000

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Ethylbenzene/styrene production technology

Changzhou Ruihua Chemical has accumulated more than ten years of experience in ethylbenzene/styrene industrial engineering design, and successfully developed a complete set of ethylbenzene/styrene process technology at the beginning of the company's establishment. After nearly 10 years of technological improvement, the technology package has reached the leading level in all evaluation indicators in the latest equipment currently in operation.

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1000

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Propylene oxide/styrene co-production technology (RHPOSM)

Propylene oxide is the third largest propylene derivative after polypropylene and acrylonitrile. It is mainly used in the production of polyether and propylene glycol. Its derivatives are widely used in industries such as automobiles, construction, food, tobacco, medicine and cosmetics. . Nearly 100 kinds of downstream products have been produced, which are important raw materials for fine chemical products.

Number of views:

1000

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Expansion Technology for Dry Gas Production of Ethylbenzene

Up to now, some domestic devices in China have applied the technology of producing ethylbenzene/styrene from dry gas, mainly those with an annual output of 60,000 to 80,000 tons of styrene, which are distributed in PetroChina, Sinopec, ChemChina and various private enterprises. The dry gas method was used as a raw material to produce ethylbenzene, which solved the problem of dry gas resource utilization at that time. However, in the actual production for many years, the load of most of the dry gas to ethylbenzene/styrene equipment cannot reach the design value, let alone increase the production capacity to increase the efficiency when the price of styrene rises.

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1000

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Aromatics Production Technology (RHAROM)

Ruihua aromatics production technology can be used to produce benzene, toluene and xylene products. This technology is highly adaptable to the market, and the product scheme can be adjusted according to demand, and it is very competitive in small and medium-sized industrial applications.

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1000

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Para-xylene crystallization technology

The process of separating p-xylene by crystallization is an older process still in use. Before the emergence of adsorption separation technology, the separation of p-xylene by crystallization was the only technology for refining p-xylene. Due to the development of adsorption technology, the existing crystallization technology for the separation of mixed xylenes for equilibrium components no longer has advantages, but the separation of mixed xylenes for high-concentration p-xylene is still attractive.

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1000

Keywords:

Maleic Anhydride Production Technology (RHMA)

Maleic anhydride is one of the three major acid anhydride raw materials in the world (acetic anhydride, maleic anhydride, phthalic anhydride), and its downstream products have a wide range of development and application prospects, which can be used in synthetic resins, coatings, pesticides, lubricant additives, medicine, and paper Treatment agents, food additives, stabilizers, etc.

Number of views:

1000

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Low-carbon olefin production technology (RHMTP)

Ruihua C4 cracking unit is transformed into methanol to propylene production technology, which can be used to produce propylene, ethylene, liquefied petroleum gas and aromatic gasoline. This technology is highly adaptable to the market, and the product scheme can be adjusted according to demand, and it is very competitive in small and medium-sized industrial applications.

Number of views:

1000

Keywords:

Succinic anhydride production technology

Succinic anhydride is a widely used organic chemical raw material. It can be used to produce vitamins, antibiotics; plant growth inhibitors, chemical intermediates and additives. It can also produce cross-linking agents, light stabilizers, and ultraviolet absorbers for polymer compounds; prepare alkyd resins, anthraquinone dyes, reinforcing fibers, and so on.

Number of views:

1000

Keywords:

Energy-saving butadiene production technology

Butadiene ranks second only to ethylene and propylene in petrochemical olefin raw materials. Butadiene is the main raw material for the production of synthetic rubber (styrene butadiene rubber, butadiene rubber, nitrile rubber, and neoprene). With the development of styrene plastics, copolymerization of styrene and butadiene is used to produce various resins with a wide range of uses (such as ABS resin, SBS resin, BS resin, MBS resin), making butadiene increasingly important in resin production status. In addition, butadiene is still used to produce 1,4-butanediol (engineering plastics), dinitrile (nylon 66 monomer), sulfolane, tetrahydrofuran, etc., so it is also an important basic chemical raw material.

Number of views:

1000

Keywords:

Core equipment

Ethylbenzene/styrene key equipment manufacturing

Number of views:

1000

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Manufacturing of key equipment for aromatics production technology

Number of views:

1000

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Manufacturing of key equipment for maleic anhydride production technology

Number of views:

1000

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Manufacturing of key equipment for propylene oxide/styrene co-production technology

Number of views:

1000

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Design and development of SMPO wastewater three-effect evaporator

The wastewater produced in the SMPO production process is extremely difficult to treat due to its high temperature, high alkalinity, and high chemical oxygen consumption characteristics, which makes it difficult for the bacteria to survive biochemical treatment.

Number of views:

1000

Keywords:

Manufacturing Technology of Double Tube Sheet Heat Exchanger

Double tube plate is a relatively common structure in heat exchangers in recent years. In order to avoid mixing of the two media in the tube side and the shell side to cause the material to be scrapped or cause a major accident, the double tube plate structure is generally adopted. During the hydraulic test of the equipment, the inner tube sheet leaked, which was difficult to rework, which would cause the equipment to be reworked. Therefore, the difficulty in manufacturing the heat exchanger with this structure was mainly the expansion of the inner tube sheet. If there is no experience in expansion of the same material and specification, expansion simulation test should be done to determine the expansion parameters.

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1000

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Key equipment for p-xylene crystallization process

Number of views:

1000

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Multiple device internals

Since its establishment 7 years ago, our company has provided various types of chemical equipment with multi-patented internals and pipeline mixers, nozzles, distributors, mixers, etc. to ensure the mixing effect of reactant streams and ensure the reaction effect. The company’s research and design in this area has significant advantages. The company has completed the research and design of coal gasifier nozzles, and the research and design of FCC heavy oil catalytic cracking nozzles. The successful research and trial production of these core equipment will bring the company to super Billion in sales. People in the industry are welcome to follow the process requirements, and we will customize them according to the requirements. We will provide a series of services from design to manufacturing, inspection, installation, etc., to relieve users from worries.

Number of views:

1000

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Catalyst

Hβ molecular sieve protective catalyst

As a kind of solid acid catalyst with three-dimensional twelve-element ring channel structure, Hβ molecular sieve has good acidity and thermal stability, and is widely used in alkylation reaction. In addition, the catalyst can effectively remove the basic nitrogen in the raw material.

Number of views:

1000

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Ethanol dehydration/tert-butanol dehydration catalyst

Changzhou Ruihua’s dehydration catalyst (RAO) has the characteristics of high specific surface area, surface acidity, high catalytic selectivity, excellent thermal stability, high mechanical strength, and good particle size, and can be used as a general dehydration catalyst.

Number of views:

1000

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Acetophenone/Dimethyl Adipate Hydrogenation Catalyst

Changzhou Ruihua's hydrogenation catalyst (KAH) has the characteristics of high conversion rate, good selectivity, high mechanical strength, and long life. It can be used as a general hydrogenation catalyst.

Number of views:

1000

Keywords:

Number of views:

1000

Para-xylene crystallization technology

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Overview

Our company has conducted in-depth research on p-xylene refining and successfully developed a complete set of process and engineering treatment technology for p-xylene crystallization and refining, forming unique technical characteristics.

Para-xylene crystallization technology adopts a two-stage crystallization process, which is suitable for high-efficiency and energy-saving recovery of PX from mixed xylene materials with high concentration of para-xylene (including o-xylene, meta-xylene, and para-xylene). The process reliability is high, the cost is low, the feed composition requirement is low, and the investment is lower.

Process feature advantages

01 Process characteristics: innovative crystallization process

02 Process advantages: crystallization technology adopts two-stage crystallization process.

Features:

(1) A two-stage crystallization process is adopted, the first stage is used to ensure the purity of p-xylene, and the second stage is used to ensure the yield of p-xylene;

(2) The scraped surface falling film crystallizer is used for the primary crystallization, which can effectively control the purity and particle size of the crystals and facilitate separation;

(3) The secondary crystallizer adopts static crystallizer, intermittent operation, simple and reliable structure, no need to set up low-temperature centrifuge;

(4) The purity of p-xylene product>99.7%, and the yield of p-xylene>90%.

(5) The heat exchange network is optimized and the energy consumption of the device is reduced.

(6) The minimum requirement of p-xylene content is >70%. If it is a balanced composition, the product can also be operated, but more energy is required.

(7) No special chemicals or adsorbents are required.

(8) Small footprint.

(9) Low fixed cost and low operating cost.

Performance characteristics

Process description

The feed is sent to the buffer tank buffer, pumped into the crystallization feed tank, and the washing liquid from the centrifuge, enters the crystallization feed tank. The material in the tank is pumped into the primary crystallizer. Para-xylene can achieve satisfactory purity of para-xylene product through primary crystallization.

After p-xylene is crystallized in the primary crystallizer, the p-xylene crystals and mother liquor flow into the centrifuge. After separation, the crystals are washed and pushed into the finished product melting tank by the centrifuge. After the crystals in the tank are heated and melted, the pressure is boosted by a pump, and then divided into two strands, one strand is sent out as a product, and the other strand is sent to the centrifuge to wash the p-xylene crystals, and the washing liquid after washing is returned and sent Crystal feed tank.

The mother liquor discharged from the centrifuge enters the primary mother liquor tank, and the mother liquor in the tank is sent to the static crystallizer to recover the p-xylene in the mother liquor. The separated mother liquor is mixed with xylene as a by-product, and the crystals are returned to the crystallization feed tank.