8 results about "Vinyl acetate synthesis" patented technology

The invention belongs to the field of chemical reaction and separation, and particularly relates to a process system for preparing vinyl acetate by an ethylene gas phase method. The system comprises a vinyl acetate synthesis system, a pre-separation system, a CO2 absorption / desorption system and a rectification system, and by optimizing a gas-liquid separation treatment mode of materials after reaction, the feeding positions of a liquid-phase product and a gas-phase product washing liquid at an outlet of a reactor in a rectification tower are improved; and a specific extraction agent is added to change the relative volatility of the product vinyl acetate and the key impurity ethyl acetate, so that the content of impurities such as ethyl acetate in the vinyl acetate product is greatly reduced, the product quality is improved, and the energy consumption of a separation system is reduced.

The invention discloses a fluidized bed activated carbon catalyst in vinyl acetate synthesis reaction and a preparation method thereof, and belongs to the technical field of activated carbon. The active carbon catalyst prepared by the method has the advantages of high catalytic efficiency, long service life and the like, can be operated under relatively high pressure, the prepared vinyl acetate is high in yield and few in by-products, and the content of benzene in the vinyl acetate product can be remarkably reduced.

The present application relates to the field of catalyst, in particular to a kind of catalyst for ethylene method synthesis vinyl acetate and its preparation method and application and the method of vinyl acetate synthesis, the optimum reaction temperature point of the catalyst in temperature programmed surface reaction process TPSR is 125~135 ℃;The catalyst contains Pd, Au and alkali metal acetate.The present application adopts the optimum reaction temperature point of temperature programmed surface reaction process TPSR for ethylene method synthesis vinyl acetate catalyst, and the problem of low selectivity of existing ethylene method vinyl acetate catalyst can be better solved.

The application discloses a catalyst for synthesizing vinyl acetate by an acetylene method and a preparation method and application thereof. The catalyst comprises an active component and a carrier, and the active component comprises zinc acetate and a strontium-iron composite oxide. The catalyst has the characteristics of high space-time yield of a target product and low content of a byproduct benzene when used for synthesizing vinyl acetate by the acetylene method.

The invention discloses a preparation method of vinyl acetate synthesis catalyst carrier activated carbon, and relates to the technical field of activated carbon preparation. Comprising the following steps: carrying out crushing and washing treatment on a carbon-containing raw material with ash content of less than 5%; mixing with a certain proportion of oxidant solution, and standing for 6-24 hours; and grinding into powder with the particle size of less than 200-300 meshes, and then adding a binder and a catalytic promoter. The catalyst carrier activated carbon provided by the invention has more developed pore channels through which synthesis raw materials and product molecules can freely enter and exit, the strength and apparent density are higher, and the prepared catalyst carrier activated carbon is detected by adopting an ASAP2020 type full-automatic pore size distribution tester static liquid nitrogen adsorption method; the mesopore volume of the activated carbon with the pore diameter in the range of 1.5-5.0 nm is greater than 0.55 mL / g, and the total pore volume is greater than 1.0 mL / g; the filling density of the activated carbon is greater than 0.45 g / mL, and the abrasive resistance is greater than or equal to 96%.

This invention discloses a method for synthesizing vinyl acetate, a catalyst for the synthesis of vinyl acetate, and a method for preparing the catalyst. The catalyst includes a support and Pd, Group IB metal, and alkali metal acetates supported on the support. The ratio of the content of strongly acidic sites to the content of weakly acidic sites on the catalyst surface is 0.15–5, preferably 0.2–4. This invention can effectively improve the space-time yield of vinyl acetate and the selectivity of the vinyl acetate synthesis reaction.

The invention relates to the field of vinyl acetate synthesis, in particular to a reproducible in-situ zinc-encapsulated molecular sieve catalyst and a preparation method thereof, application of the reproducible in-situ zinc-encapsulated molecular sieve catalyst in a reaction for preparing vinyl acetate through acetylene acetic acid, and a regeneration treatment method of the reproducible in-situ zinc-encapsulated molecular sieve catalyst. The particle size of the molecular sieve catalyst is 50nm-100nm, the specific surface area is 300m < 2 > / g-400m < 2 > / g, and the zinc coating amount of the molecular sieve catalyst is 0.8 wt%-5wt%. The molecular sieve catalyst can anchor active components, inhibit loss of the active components and further improve the atom utilization rate of the active components, is high in catalytic activity and greatly improves the stability of a reaction for preparing vinyl acetate through acetylene acetic acid. Meanwhile, the molecular sieve catalyst can be used for removing deposited carbon through a regeneration treatment method, so that the regenerated catalyst capable of being recycled is obtained, and the molecular sieve catalyst has important application in industrial production.

The application discloses a fluidized bed activated carbon catalyst in a vinyl acetate synthesis reaction and a preparation method thereof, and belongs to the technical field of activated carbon. The prepared activated carbon catalyst has the advantages of high catalytic efficiency, long service life, and the like, can operate under high pressure, and has the advantages of high vinyl acetate yield, few by-products, and the like, and can significantly reduce the content of benzene in the vinyl acetate product.