72 results about "Ethylidene diacetate" patented technology

This invention provides an integrated multistep economical process for the production of vinyl acetate monomer (VAM) from acetic acid in the vapor phase. First, acetic acid is selectively hydrogenated over a hydrogenating catalyst composition to form acetaldehyde. Acetaldehyde so formed can be converted to ethylidene diacetate via reaction with acetic anhydride. In a subsequent step so formed ethylidene diacetate is thermally decomposed to form VAM and acetic acid. Alternatively, acetaldehyde formed in the first step can selectively be reacted with ketene to form VAM. In an embodiment of this invention reaction of acetic acid and hydrogen over platinum and iron supported on silica selectively produces acetaldehyde in a vapor phase at a temperature of about 300° C., which is selectively hydrogenated over platinum supported catalyst to form ethanol and dehydrated over NAFION catalyst to form ethylene at a temperature of about 185° C., which is mixed with molecular oxygen, acetic acid and reacted over a palladium / gold / potassium catalyst supported on titania to form VAM at a temperature of about 150° C. to 170° C.

The disclosure relates to a process for the preparation of acetic acid. The process comprises reacting a decanter heavy, organic phase of an acetic acid production process with acetic anhydride to convert acetaldehyde in the decanter heavy, organic phase to ethylidene diacetate and separating it from the decanter heavy, organic phase. Ethylidene diacetate can be hydrolyzed to recover acetic acid.

The invention relates to a preparation method of ethylidene diacetate, which is mainly used for solving the problems that in the prior art, conversion rate of methyl acetate using pyridine as a promoter is low, yield of ethylidene diacetate is low and selectivity is low. The method is used for synthesizing the ethylidene diacetate with methyl acetate, carbon monoxide and hydrogen as raw materials and acetic acid as a solvent at a reaction temperature of 130-200 DEG C, a reaction pressure of 2-10 MPa and a reaction time of 3-10 hours, the main catalyst is selected from platinum group metals or compounds thereof, the auxiliary catalyst is an iodide, an oxynitride selected from the general formula (I) is used as the promoter, the technical scheme is used for well solving the problem, and the preparation method can be used in the production of vinyl acetate. The formula is described in the specification.

The invention relates to an ethylidene diacetate method vinyl acetate catalyst and a vinyl acetate synthesis method, which are mainly used for solving the problems of low ethylidene diacetate conversion rate and poor vinyl acetate selectivity in the prior part. The problems are well solved through the adoption of the technical scheme that the catalyst is cation exchange resin which contains H+ and metal ions, wherein the metal ions are selected from at least one of alkaline-earth metal ions and transition metal ions, the metal ions accounts for a percentage p (20%-80%) of cation sites in the cation exchange resin, and H+ accounts for a percentage q (1 minus p) of the cation sites. The catalyst can be used in production of vinyl acetate.

The invention relates to a synthetic method for synthesizing ethylidene diacetate through carbonylation of methyl acetate, mainly solving the problems that the conversion rate of reactant methyl acetate during the synthesis of ethylidene diacetate through carbonylation of methyl acetate is low and the yield and selectivity of ethylidene diacetate are low when organic nitrogen or organic phosphorus is used as an accelerant in the prior art. The technical scheme of the synthetic method is as follows: methyl acetate, carbon monoxide and hydrogen are used as raw materials, acetate acid is used as a solvent, ethylidene diacetate is synthesized under the conditions that the reaction temperature is 130-200 DEG C, the reaction pressure is 2-10MPa and the reaction time is 3-10h, a main catalyst adopts ironic series metals or compounds thereof, a catalyst promoter is iodide and the accelerant is crown ether. By adopting the synthetic method, the problems are well solved, and the synthetic method can be used for production of vinyl acetate.

The invention relates to a preparation method for preparing ethylidene diacetate from methyl acetate, which mainly solves the problems that the methyl acetate conversion rate is low and the ethylidene diacetate selectivity is low in the prior art. The invention adopts the following technical scheme: the preparation method for preparing ethylidene diacetate from methyl acetate comprises the following step: reacting MeOAc, CO and H2 used as raw materials in the presence of a supported catalyst, a cocatalyst and a promoter, thus generating the ethylidene diacetate, wherein the supported catalyst comprises a core-shell type support and a VIII metal or VIII metal compound supported on the support; the cocatalyst is an iodine-containing compound; the promoter is a nitrogen-oxygen organic substance or phosphorus-containing compound; and the core-shell type support has an amorphous aluminum oxide core and an amorphous silicon oxide shell. Thus, the technical scheme well solves the problems. The invention can be used for production of vinyl acetate.