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Experimental device of Sichuan Institute of Technology

BIG in Small

Methanol cracking to produce carbon monoxide

The product of our company - the device for preparing carbon monoxide is adopted. This method uses methanol cracking pressure swing adsorption to prepare carbon monoxide. This technology uses methanol as the raw material, which is cracked into a mixture of hydrogen and carbon monoxide through catalyst under a certain temperature and pressure, and then obtains pure hydrogen and carbon monoxide through pressure swing adsorption separation.

Technical features:

·Easy source of raw materials, convenient transportation and storage, and stable price.

·The device is corrosion free, highly automatic, simple and easy to operate.

·Low energy consumption and low product cost.

·The unique catalyst has few side reactions, high conversion and is not easy to form carbon.

Reaction principle:


Main performance indicators

Unit size

50~300Nm3/h (single train)






normal atmospheric temperature

4 VCM tail gas recovery and hydrogen recovery

In the production of PVC, VCM tail gas contains vinyl chloride, acetylene, hydrogen and nitrogen, which pollute the air and waste useful gas when discharged into the atmosphere; The one-stage or two-stage PSA process technology is adopted to recover vinyl chloride and acetylene from the vent tail gas, return them to the gas holder for recycling, and return hydrogen to the hydrogen chloride section. Our company adopts staged recovery technology, and the VOC content in the exhaust gas is less than 1ppm.

5 Gas drying technology

5.1 Deep drying of chlorine and hydrogen chloride

Due to the special properties of chlorine and hydrogen chloride, the traditional chlorine and hydrogen chloride drying uses concentrated sulfuric acid, but the water content can only reach about 50ppm, making it difficult to improve the quality of the corresponding follow-up products, which is also difficult for China's PVC and chlorosilane to reach the product quality of the world's advanced countries.

The special process and special adsorbent developed by our company for drying can reduce the water content in chlorine and hydrogen chloride to below 10ppm, surpassing the level of other advanced countries in the world.

5.2 Acetylene deep drying technology

Due to the special nature of acetylene gas, the traditional acetylene drying method adopts the freezing method, which has high operation cost and low dehydration accuracy, affects the subsequent product quality and high selection of equipment materials, and its investment is too high; For this reason, the special process and special adsorbent developed by our company can dry the acetylene gas to make the water content lower than 20ppm, and the device operates safely and reliably, reaching the domestic advanced level.

5.3 Hydrogen drying

6. Removal of chlorosilane from process gas of silicon industry

During the silicon production process in the photovoltaic industry, the hydrogen in the tail gas of the reduction furnace, synthesis furnace and hydrogenation furnace contains a certain amount of hydrogen chloride and chlorosilane. The chloride is removed to purify high-purity hydrogen, and chlorosilane is recovered. After years of technological development by our company, we have broken the monopoly of production equipment in foreign countries and saved tens of millions of dollars of foreign exchange for the country every year. This technology is at the international advanced level.

7 VOCS organic gas purification and recovery technology

The pressurization+condensation (membrane separation)+adsorption process technology is used to treat the organic components in the tail gas (oil gas, air, etc.). The purified gas meets the national environmental protection emission standards. The organic condensate is recycled and the device realizes automatic, continuous and stable operation; Increase the economic benefits of enterprises and achieve environmental protection production.

8 Recovery technology of light hydrocarbon in associated gas of oilfield

The multi-component refrigerant mixture is used as the working medium to cool the feed gas after deacidification, dehydration and other purification treatment (which can be as low as - 50 ℃), and then to obtain products such as natural gas, LPG and NGL through rectification and separation, so as to achieve the purpose of light hydrocarbon recovery.

9 Natural Gas Liquefaction Technology (LNG)

The multi-component refrigerant mixture is used as the working medium to conduct step by step condensation, evaporation, throttling and expansion to obtain refrigeration capacity at different temperature levels, so as to achieve gradual cooling and liquefaction. LNG products are obtained by liquefaction of purified natural gas after deacidification and dehydration.

10 Membrane separation technology

Membrane separation technology is one of the three major technologies for gas separation at present. By using the high-performance Prisson membrane imported from the United States and the self-designed process flow, our company can recover the hydrogen in the traditional process of synthetic ammonia vent gas, ammonia tank purge gas and methanol purge gas, and then return to the synthetic ammonia system and methanol synthesis system, or further purify it into high-purity hydrogen, so as to achieve the purpose of increasing production and reducing consumption and serve as a hydrogenation product, The purity of hydrogen reaches 90%~99.9%.

11 MDEA or MEA decarburization and desulfurization technology

Decarbonization&desulfurization technology uses MDEA or MEA series solutions as absorbent. Under certain pressure and low temperature conditions, the absorbent and feed gas are countercurrent contacted in the absorber, and absorbed by the absorbent through mass transfer and chemical reaction to achieve the purpose of purifying feed gas. The absorbent after absorbing acid gas can realize regeneration and reuse by depressurization and heating to desorb acid gas.

12 Complete equipment for PSA air separation and oxygen generation

The original imported new highly efficient air separation oxygen production adsorbent is used. The process flow is advanced, the supporting equipment is reliable, the quality is excellent, and the level of equipment automation is high. Unmanned management can be achieved. The power consumption per unit of oxygen production is more than 10% lower than that of similar domestic products. The large production scale is more than 10000Nm3/h, and the oxygen purity is 90~95%.

13 PSA Nitrogen Production Technology and Complete Plants

The high-purity nitrogen system provided by PERMEA of AIR PRODUCTS is the best PSA nitrogen system in the world AIR PRODUCTS has Competitive leadership: 1) process technology; 2).. Valve design and construction; 3) unique high-purity N2 system.

PSA nitrogen system uses proprietary carbon molecular sieve (CMS) and advanced process design to make the nitrogen generation system have the characteristics of low investment cost, low energy consumption, small pressure drop, and less equipment maintenance compared with other PSA nitrogen systems.

PSA nitrogen system does not need standby liquid nitrogen to meet the continuous gas consumption of users, and is especially suitable for locations where there is no liquid nitrogen or where liquid nitrogen is more expensive.

Small footprint, compact structure, space saving, can be used for indoor and outdoor operations.

It is easy to install and start on site, and the system is fully automatic, without the need for multiple people to look after it.

Due to the full regulation function, nitrogen purity (95%~99.9995%) and flow can be controlled, which can greatly save energy when nitrogen consumption or nitrogen purity is reduced.

Super filtration protection system reduces the pollution of carbon molecular sieve; Advanced compression technology of carbon molecular sieve reduces the pulverization of carbon molecular sieve and the drop of bed layer, thus reducing the performance

The durability of PSA nitrogen system has been proved by years of practical experience, and the design service life of carbon molecular sieve is usually more than ten years. More than 400 PSA nitrogen systems have been sold and installed around the world.

14 Crude benzol hydrogenation unit

The domestic self-developed crude benzol low temperature hydrotreating technology is adopted, and the production technology is advanced and reliable. The products produced by this unit include pure benzene, toluene, xylene, non aromatic hydrocarbons and heavy benzene The main products are pure benzene, toluene and xylene.

After the heavy benzene is removed through raw material pretreatment, the crude benzene enters the hydrogenation process. All impurities in the crude benzene, mainly thiophene, are removed by low-temperature hydrogenation, in which all sulfides are converted into H2S, nitrides into NH3, oxides into H2O, and unsaturated hydrocarbons are hydrogenated to saturation; Then the impurities are removed by conventional distillation and extractive distillation to produce high-quality benzene, toluene and xylene.

15 Formamide unit

This technology adopts an energy-saving formamide separation device produced by our company. It uses methanol dehydrogenation method to produce methyl formate with convenient raw material sources and small investment. This method is characterized by low construction investment, convenient raw material sources, simple equipment manufacturing, and short construction period, which is especially suitable for medium and small scale devices. The by-product hydrogen can be used as raw material for hydrogenation products after purification. Several formamide units have been built and operated normally in our company.

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