haohan二甲醚分析专用毛细管柱30m*0.53mm

Dimethyl ether production methods are one-step and two-step method. One-step method refers to the synthesis of dimethyl ether from the feed gas, the two-step synthesis of methanol from the synthesis gas, and then dehydration system of dimethyl ether.
In this case,
One-step production line of methyl ether
In this case,
The synthesis gas is fed into the synthesis reactor through the natural gas conversion or the coal gasification, and the two reaction processes and the conversion reaction of the methanol synthesis and the methanol dehydration are completed simultaneously in the reactor. The product is a mixture of methanol and dimethyl ether , The mixture was separated by the distillation device of dimethyl ether, unreacted methanol back to the synthesis reactor.
In this case,
One-step multi-use of dual-function catalyst, the catalyst is generally two types of catalysts from the physical mixture, one of which is the synthesis of methanol catalyst, such as Cu-Zn-Al (O) -based catalyst BASFS3-85 and ICI-512; One type is methanol dehydration catalyst, such as alumina, porous SiO2-Al2O3, Y type molecular sieve, ZSM-5 molecular sieve, mordenite and the like.
In this case,
Two-step method
In this case,
The method is carried out in two steps, namely, synthesis of methanol from the synthesis of methanol, methanol in the solid catalyst dehydration of dimethyl ether. The ZSM-5 zeolite containing γ-Al2O3 / SiO2 is used as a dehydration catalyst in the world. The reaction temperature was controlled at 280-340 ° C and the pressure was 0.5-0.8 MPa. The single-pass conversion of methanol is between 70-85% and the selectivity of dimethyl ether is more than 98%.
In this case,
Compared with the two-step method, the process is simple, the equipment is small, the investment is small and the operation cost is low, so the production cost of DME is reduced and the economic benefit is improved. Therefore, one-step synthesis of dimethyl ether is a hot spot at home and abroad. Developed a representative one-step process abroad: Denmark Topsφe process, the United States Air Products and Japan NKK process technology.
In this case,
Two-step synthesis of dimethyl ether is the main process of dimethyl ether production at home and abroad, the method to fine methanol as raw materials, dehydration reaction by-product less dimethyl ether purity of 99.9%, mature technology, equipment adaptability, Treatment is simple, can be directly built in the methanol production plant can also be built in other public facilities good non-methanol production plant. But the law to go through methanol synthesis, methanol distillation, methanol dehydration and dimethyl ether distillation process, a longer process, and thus a larger investment in equipment. However, most of the large-scale DME construction projects announced by foreign countries adopt the two-step process technology, which shows that the two-step method has strong comprehensive competitiveness.