1142 results about "Protein carbonyl" patented technology

The invention relates to a process for the production of acetic acid by carbonylation of methanol, and reactive derivatives thereof, in a reaction mixture using a rhodium-based catalyst in low water conditions. The process is used to achieve reaction rates of at least 15 g mol/l/hr. The high rate reactions proceed at water concentrations of less than 2.0 wt. %. Under certain conditions, the water concentration in the reaction mixture of the process is maintained at a desired concentration by at least one process step including adding a compound such as methyl acetate, dimethyl ether, acetic anhydride, or mixtures of these compounds to the reaction system. The process step of adding the components to the reaction mixture may be combined with other process steps for controlling water concentrations in reaction mixtures for the carbonylation of methanol.

The present invention relates to carbonylation of methanol, methyl acetate, dimethyl ether or mixtures thereof to produce glacial acetic acid, and more specifically to the manufacture of glacial acetic acid by the reaction of methanol, methyl acetate, dimethyl ether or mixtures thereof with carbon monoxide wherein the product glacial acetic acid contains low impurities.

Process for converting synthesis gas to ethanol, including the steps of 1) introducing synthesis gas, together with methyl ethanoate and/or ethyl ethanoate, into an alcohol synthesis unit to produce methanol and ethanol, 2) separating the methanol from the ethanol of step 1, 3) introducing methanol, from step 2, together with CO, into a carbonylation unit in the presence of a methanol carbonylation catalyst, to produce ethanoic acid, and 4) introducing ethanoic acid, from step 3, together with methanol and/or ethanol, into an esterification unit to produce methyl ethanoate and/or ethyl ethanoate. In step 5), methyl ethanoate and/or ethyl ethanoate, produced in step 4, are fed into the alcohol synthesis unit of step 1, and in step 6) ethanol from step 2 is recovered.

A carbonylation catalyst useful for producing esters and carboxylic acids in a vapor phase carbonylation process, wherein the catalyst includes a solid component having a catalytically effective amount of platinum and tin associated with a solid catalyst support material and a vaporous halide promoter component.

Disclosed is a continuous process wherein carbon monoxide, a carbonylatable reactant, and a halide in the gas phase are contacted with a non-volatile catalyst solution comprising an ionic liquid and a Group VIII metal to produce a carbonylation product in the gas phase. The process is useful for the continuous preparation of acetic acid by the carbonylation of methanol.

Acetic acid is produced while inhibiting an increased concentration or production of hydrogen iodide in a carbonylation reactor or corrosion of the carbonylation reactor.

A production process of acetic acid comprises a reaction step for continuously allowing methanol to react with carbon monoxide in the presence of a catalyst system comprising a metal catalyst (e.g., a rhodium catalyst), an ionic iodide (e.g., lithium iodide), and methyl iodide in a carbonylation reactor; and in the process, (i) the concentration of the metal catalyst is maintained at not less than 860 ppm on the basis of weight, the concentration of water is maintained at 0.8 to 15% by weight, the concentration of methyl iodide is maintained at not more than 13.9% by weight, and the concentration of methyl acetate is maintained at not less than 0.1% by weight, in a whole liquid phase in the reactor, and/or (ii) the concentration of the metal catalyst is maintained at not less than 660 ppm on the basis of weight, the concentration of water is maintained at 0.8 to 3.9% by weight, the concentration of the ionic iodide is maintained at not more than 13% by weight, the concentration of methyl iodide is maintained at not more than 13.9% by weight, and the concentration of methyl acetate is maintained at not less than 0.1% by weight, in a whole liquid phase in the reactor.

The invention discloses a preparation method for a catalyst for synthesizing oxalic ester by gas-phase. The catalyst takes alpha-alumina as a carrier, palladium as an active component and 2 MOxes as an additive, M is magnesium, titanium, zirconium, vanadium, manganese, iron, nickel, copper, zinc, molybdenum or tungsten, and components of the catalyst (calculated by carrier mass) are: 0.01 to 0.75 percent of the palladium and 0.1 to 20 percent of MOxes. The preparation method comprises the following steps that: firstly, an additive metal salt solution is used to impregnate the carrier, and a palladium salt solution is used to impregnate the carrier to obtain the catalyst after the carrier is dried and roasted. Before the use, pure hydrogen or H2-N2 mixed gas is activated by the catalyst at a temperature of between 150 and 450 DEG C. The catalyst can be used for synthesizing oxalic ester by the carbonylation of CO and nitrous acid ester, the using reaction temperature of the catalyst is between 70 and 150 DEG C, and the reaction space velocity is between 500 and 9,000h<-1>. The catalyst has higher reaction activity and selectivity; and the catalyst has low cost.

This invention relates to processes for producing acetic acid and, in particular, to improved processes for recovering C₂₊ alkyl halides and removing permanganate reducing compounds formed during the carbonylation of methanol in the presence of a Group VIII metal carbonylation catalyst to produce acetic acid.

Disclosed is a carbonylation process for the production of carboxylic acids, carboxylic acid esters and/or carboxylic acid anhydrides wherein a carbonylation feedstock compound selected from one or more organic oxygenates such as alcohols, ethers, and esters is contacted with carbon monoxide in the presence of a carbonylation catalyst and one or more onium compounds. The carbonylation process differs from known carbonylation processes in that a halide compound such as a hydrogen halide, typically hydrogen iodide, and/or alkyl halide, typically methyl iodide, extraneous or exogenous to the carbonylation process is not fed or supplied separately to the process.

This invention relates to carbonylation of methanol, methyl acetate, dimethyl ether or mixtures thereof to produce glacial acetic acid, and more specifically to the manufacture of glacial acetic acid by the reaction of methanol, methyl acetate dimethyl ether or mixtures thereof with carbon monoxide wherein the product glacial acetic acid contains low formic acid impurities.

Provided in the present invention is a process for preparing methyl acetate through carbonylation of dimethyl ether, comprising: passing a feed gas containing dimethyl ether, carbon monoxide, and optional hydrogen gas through a reactor loaded with a mordenite molecular sieve catalyst, and preparing methyl acetate by reacting same at a reaction temperature of 19 to 320°C, a reaction pressure of 0.5 to 20.0 Mpa, and a gas volume space velocity of 500 to 5000 h-1; wherein the mordenite molecular sieve catalyst is a hydrogen-type mordenite molecular sieve catalyst with an adsorbed organic amine, the molar ratio of the dimethyl ether to carbon monoxide in the feed gas is DME/CO = 1/1 to 1/15, the molar ratio of the hydrogen gas to carbon monoxide is H2/CO = 0 to 10/1, and the dimethyl ether in the feed gas is charged into the reactor by means of feeding in stages. The present invention is characterized in that: through treatment by organic amine adsorption, the temperature distribution of catalyst bed can be effectively controlled so as to avoid the occurrence of hot points, and thereby side reactions are reduced, the selectivity of target product is improved, and the lifetime of the catalyst is greatly extended.

The invention discloses a catalyst for synthesis of methyl methoxyacetate (MMAC) by use of dimethoxymethane (DMM) and CO as raw materials, the catalyst is a molecular sieve with twelve membered ring cavity, ten membered ring channel and supercage structures, the International Zeolite Association (IZA) defines the topological structure of the catalyst as MWW type such as MCM-22 and MCM-49, the molecular formula is SixAlyOz, and the molecular sieve is hydrogen type. The molecular sieve SiO2 / Al2O3 ratio is 10-200. Carbonylation reaction is performed in a gas-solid phase fixed bed reactor, the reaction pressure is 1-50*105Pa, a reaction raw material gas comprises the dimethoxymethane with the partial pressure of 1-50kPa and balance of CO (1-49*105Pa) or CO / He (1-49* 105Pa), the reaction temperature is 60-180 DEG C, and the space velocity is 20-500L .g<-1>.h<-1>. Compared with a MFI type molecular sieve (HZSM-5) only having a crossed ten membered ring structure and a BEA type molecular sieve (Hbeta) only having a twelve membered ring structure, the MWW type molecular sieve has higher methyl methoxyacetate selectivity.

Disclosed is a method of controlling a separation process for removing moving permanganate reducing compounds from a process stream in the methanol carbonylation process for making acetic acid, where the method includes the steps of measuring the density of a stream containing acetaldehyde and methyl iodide, optionally calculating the relative concentrations of acetaldehyde and methyl iodide in the stream, and adjusting distillation or extraction process parameters based on the measured density or one or more relative concentrations calculated therefrom.

The invention relates to a process for indirectly producing alcohol with synthetic gas. The process comprises the steps that the synthetic gas formed by mixing industrial carbon monoxide with hydrogen is taken as a raw material to synthesize methanol; methanol is dehydrated to prepare dimethyl ether; dimethyl ether, carbon monoxide and hydrogen are mixed for carbonylation reaction to prepare methyl acetate; methyl acetate is purified and hydrogenated; a hydrogenated product is purified; and an alcohol product is obtained. An adopted catalyst, the process and a device have the characteristics of high conversion per pass and high effective utilization rate of reaction heat; the load of separating a crude product is reduced greatly; the production flow is shortened; and the production energy consumption is reduced greatly.