150 results about "Decarbonylation" patented technology

There is disclosed a method for conversion of crude tall oil into high-quality diesel fuels comprising the steps of: (a) removal of non-oil contaminants present in the crude tall oil and recovering valuable organic compounds present in the crude tall oil, thereby forming a refined tall oil stream; (b) removal of the volatile fraction of the refined tall oil stream from step a), thereby forming a volatiles free oil stream comprising organic components with boiling points, at atmospheric pressure, of 170 degrees C. or higher; (c) separation in a vacuum distillation column of the volatiles free oil stream of step b) into two process streams or phases wherein a first process stream or phase is substantially comprising components with boiling points, at atmospheric pressure, in the range of 170-400 degrees C. and a second process stream or phase is substantially comprising components with boiling points, at atmospheric pressure, over 400 degrees C.; (d) lowering the oxygen content in the stream comprised of components with boiling points in the range 200-400 degrees C. from step c) by decarboxylation and/or decarbonylation.

The invention concerns a process for hydrodeoxygenation of feeds derived from renewable sources with conversion by decarboxylation/decarbonylation limited to at most 10%, using a bulk or supported catalyst comprising an active phase constituted by at least one element from group VIB and at least one element from group VIII, said elements being in the sulphide form, and the atomic ratio of the metal (or metals) from group VIII to the metal (or metals) from group VIB being strictly more than 0 and less than 0.095, said process being carried out at a temperature in the range 120° C. to 450° C., at a pressure in the range 1 MPa to 10 MPa, at an hourly space velocity in the range 0.1 h⁻¹ to 10 h⁻¹, and in the presence of a total quantity of hydrogen mixed with the feed such that the hydrogen/feed ratio is in the range 50 to 3000 Nm³ of hydrogen/m³ of feed.

A process for the complete deoxygenation of an oxygenate, especially those from bio-oils comprises forming a reaction mixture comprising the oxygenate, molecular hydrogen, and a hydrodeoxygenation catalyst in a solvent. The reaction mixture is maintained at a temperature that is 0.7 to 1.3 times the solvent critical temperature in absolute temperature units (K). Complete deoxygenation occurs via a hydrodeoxygenation pathway and a decarbonylation pathway.

The invention belongs to a chemical technology and the technical field of a renewable energy source, and relates to a method for producing second-generation biodiesel by hydrogenation production of illegal cooking oil. The method comprises the following steps: firstly, carrying out pretreatments such as filtering, dewatering and desalting, on the collected illegal cooking oil; respectively carrying out reaction, such as hydrodeoxygenation, hydrogenation decarboxylation and hydrogenation decarbonylation, in the presence of a transition metal phosphide catalyst so as to obtain the second-generation biodiesel. By adopting the method, the noble metal property and excellent hydrogenation performance of the transition metal phosphide are fully utilized, the illegal cooking oil is directly converted into oxygen-free fat alkanes, no byproduct for polluting the environment is generated, meanwhile, the method has the advantages of simple process, is clean and environmental, low in energy consumption and the like, the obtained diesel is high in cetane number and low in condensation point, has good economic and social benefits, and has important practical significance on growing fuel requirements.

A process for producing an aromatic polycarbonate through an ester interchange reaction between an aromatic carbonic acid diester and an aromatic dihydroxy compound, wherein the aromatic carbonic acid diester is obtained through the decarbonylation reaction of an aromatic oxalic acid diester represented by the following general formula (1):wherein two Ar's are the same or different aromatic hydrocarbon groups having 6 to 14 carbon atoms, and has a hydrolyzable halogen content of 5 ppm or less.According to the present invention, an aromatic polycarbonate having a high molecular weight and excellent color can be easily produced without impairing ester interchange reactivity for the production of the aromatic polycarbonate by using an aromatic carbonic acid diester obtained through the decarbonylation of an aromatic oxalic acid diester and controlling the amount of hydrolyzable halogen contained in the aromatic carbonic acid diester to a value smaller than a predetermined value.

A feedstock originating from renewable sources is converted to branched and saturated hydrocarbons without heteroatoms in the diesel fuel distillation range by skeletal isomerisation and deoxygenation carried out by hydrodeoxygenation or alternatively by combined decarboxylation and decarbonylation reactions, whereby the consumption of hydrogen is decreased.

The invention provides a catalyst used for preparing furan from decarbonylation of furfural, and a preparation method and an application thereof. The active ingredients of the catalyst is prepared by a microemulsion method and loaded on a carrier, the main active ingredient Pd of the prepared catalyst has small particle size, narrow distribution and good dispersity, with the particle size smaller than 10 nm. The preparation method of the catalyst is simple, mild in operation conditions and easy to produce. When the catalyst is applied in a reaction for preparing furan from decarbonylation of furfural, the reaction has relatively high furfural conversion rate and the catalyst has relatively high activity and selectivity.

The invention discloses a chemical-enzymatic preparation of UDCA. The chemical-enzymatic preparation of UDCA is characterized by comprising the following synthesis procedures: a) oxidizing UDCA under the action of 12alpha-HSDH to obtain 12-ketodeoxycholic acid, b) carrying out a decarbonylation reduction reaction on 12-ketodeoxycholic acid to obtain lithocholic acid, and c) carrying out hydroxylation on the lithocholic acid under the action of 7alpha-LCAH to obtain UDCA. Compared with the prior art, the chemical-enzymatic preparation of UDCA disclosed by the invention is low-cost and readily available in raw materials, mild in reaction conditions, less in steps and simple in post-treatment, and the substrate concentration reaches up to 100g /L, the total yield is 73%, the product purity is more than 99%, and the industrial large-scale production has very good application prospects.

The invention relates to a good-hydrothermal-stability hydrodeoxygenation catalyst, and preparation and applications thereof. The preparation method of the catalyst comprises: mixing alumina and magnesium aluminate spinel according to a mass ratio of 1-25:1, adding molybdenum trioxide accounting for 5-50% by mass of the mixed powder and kneading to prepare a support containing molybdenum trioxide; drying the support, roasting and cooling to obtain a magnesium-aluminate-spinel-modified catalyst support; immersing the support in a nickel nitrate solution, and roasting to obtain an oxidation-state catalyst; performing precuring on the oxidation-state catalyst to obtain an activated hydrodeoxygenation catalyst used to prepare biodiesel by hydrodeoxygenation of animal and vegetable oil; and wherein the operation temperature is 350-380 DEG C, the liquid hourly space velocity is 4-6 h<-1>, the hydrogen partial pressure is 3.5-5.5 MPa, and the hydrogen-oil ratio is 200-600. The alkane yield is 81.8%, the deoxidation rate is 99.8%, and the ratio of a hydrogenation decarboxylation/decarbonylation reaction and a dehydration reaction is 1-1.5:2; and the hydrodeoxygenation catalyst has higher hydrodeoxygenation activity, stability and good hydrothermal stability.

The invention provides a method for preparing a palladium-carbon catalyst for preparing furan through the furfural decarbonylation process. According to the method, a precursor complex palladium chloride of an active component or a salt mixture of the palladium chloride with other noble metal salts is mixed with aqueous ammonia to form a palladium ammonia complex solution. The palladium ammonia complex solution is mixed with an auxiliary alkali metal salt and a carrier activated carbon to steep the auxiliary alkali metal salt and the carrier activated carbon and add a reducing agent so as to cause the occurrence of chemical reduction reaction. After that, through the solid-liquid separation process, the palladium-carbon catalyst can be obtained. The service life of the catalyst is significantly prolonged compared with that of a conventional catalyst in the prior art. Meanwhile, the furan production efficiency based on the furfural decarbonylation process is improved. The catalyst prepared in the present invention has the characteristics of high activity, high selectivity, long service life and good stability at the same time.

The invention relates to asymmetric synthesis of chiral muskone and other 3-methyl cyclic ketone. The asymmetric synthesis comprises the following steps: generating a Michael addition product by taking cyclic ketene and dual-sulfonyl methane as raw materials, the chiral catalyst containing one or more functional groups of primary amine, tertiary amine, urea or thiourea or salt thereof as a catalytic system and an organic solvent as a reaction carrier and conducting reaction at 0 to 100 DEG C for 2 and 10 days; and performing carbonyl protection, selective dual-sulfonyl removal and decarbonylation protection by taking the Michael addition product as a start raw material to synthesize the chiral muskone and other 3-methyl cyclic ketone. The invention realizes high-conversion and high-selectivity synthesis of the chiral muskone and other 3-methyl cyclic ketone for the first time, ensures that the synthesized muskone has the same structure as the natural muskone and overcomes the shortcomings of small content and high price of the natural muskone; and moreover, as the reaction conditions are mild, the operation is simple and the raw materials are cheap and readily available, the invention is suitable for industrial production and application.

The invention discloses a synthesis method of perfluoroisobutyronitrile, comprising the following steps of: (1) carrying out a reaction between oxalyl chloride monoester and fluoride salt in a solventto obtain oxalyl fluoride monoester; (2) carrying out a reaction between oxalyl fluoride monoester and hexafluoropropylene in a solvent by taking fluoride salt as a catalyst to prepare heptafluoro-2-carbonyl-3-methylbutyrate; (3) carrying out catalytic decarbonylation on heptafluoro-2-carbonyl-3-methylbutyrate in a solvent through cesium fluoride, so as to obtain heptafluoroisobutyrate; and (4) carrying out a reaction between heptafluoroisobutyrate and ammonia, and dehydrating to obtain perfluoroisobutyronitrile. The synthetic method has the advantages of easily available raw materials, mildreaction conditions, high raw material conversion rate and product yield, safe and simple process operation, and easy realization of industrial production.

The invention provides a catalyst for producing furan by furfural liquid-phase decarbonylation and a preparation method. In the catalyst, expression gamma-Al2O3 and MO are taken as a composite carrier and the promoter MO is oxides of K, Cs or Li. MO accounts for 0.5-2.0wt% of the composite carrier. The active component of the catalyst is Pd and the parent of Pd is PdCl2 (or Pd(NO3)2 or [Pd(C2H3O2)2]3. Pd accounts for 5wt% of the composite carrier. The catalyst is prepared by means of dipping precipitation and has good activity in furfural liquid-phase decarbonylation reaction with furfural percent conversion of 92.5-98.2%, furan selectivity of 85.3-94.2% and has long service life of 100-120h.

The invention discloses a method for hydrocarbon preparation through high-grade fatty acid ester hydrogenation. In the presence of hydrogen, a high-grade fatty acid ester-containing raw material contacts with a catalyst and undergoes a reaction. The method is characterized in that the catalyst contains a phosphide of VIII group metal or VIII group-VIB metal and the raw material contains 50-10000wtppm by sulfur weight of a sulfur-containing compound. Compared with the prior art, the method has better hydrogenation decarbonylation and hydrogenation decarboxylation selectivity.

The invention discloses a method for indirectly synthesizing dimethyl carbonate by CO gas phase oxidative coupling and decarbonylation. In the process, the reaction conditions are mild, a catalyst is noncorrosive to equipment, and the yield and quality of the dimethyl carbonate are high. The basic raw materials required by the method can be prepared from a carbon resource, so the method is in accordance with the current condition that China has rich coal resource, and has a great significance for reducing dependency on oil resource.

The invention discloses a method for producing liquid paraffin by using waste animal and vegetable oil. The method comprises the following steps: using the waste animal and vegetable oil as a raw material, after impurity-removing purification pre-treatment, entering a fixed bed reactor loaded with a catalyst, performing hydrodeoxygenation, decarbonylation and decarboxylation reactions to prepare the liquid paraffin, and performing rectification, to obtain C8-C13 short-chain liquid paraffin, C13-C18 medium-chain liquid paraffin and C17-C24 long-chain liquid paraffin, wherein the catalyst is a Ni-Mo-Co/Al3O2 supported catalyst prepared by using a supersaturated dipping method. The method has the characteristics of simple preparation technologies and devices, low production cost, low catalysis life, high waste oil conversion rate, high yield and quality of liquid paraffin products.

The invention relates to a method for selective preparation of toluene from 4-methyl-3-cyclohexene-1-carbaldehyde. Specifically speaking, the method comprises the following steps: dehydrogenation and aromatization reaction as well as decarbonylation reaction of 4-methyl-3-cyclohexene-1-carbaldehyde are carried out under the effects of a supported type metal catalyst at 200-400 DEG C, and toluene is prepared. The method can be carried out in a fixed bed reactor, or a fluidized bed reactor or a moving-bed reactor separately, and reaction raw materials are directly injected into a reaction tube, or the reaction raw materials pass a catalyst bed layer with purging of carrier gas, liquid space velocity can be controlled, and toluene is synthesized. The process has the advantages of simple reaction process, and high selectivity of target product; the substrates can be obtained by Diels-Alder reaction from isoprene and acrolein which are derived from biomass resources and are used as raw materials, and a new route for preparing toluene from biomass is provided.

The invention relates to the field of biological enzyme biomimetic chemistry and new energy materials, specifically to amido bisphosphine chelate-substituted Fe-Fe hydrogenase mimics, a photochemicalsynthesis method and application thereof. The mimics chemically simulate three kinds of basic structures containing different propylene-containing diiron disulfide butterfly-shaped skeletons of the natural Fe-Fe hydrogenase enzyme catalytic activity center and catalytic functions more comprehensively. Compared with the conventional oxidative decarbonylation method and heating reflux method, the photochemical synthesis method provided by the invention has the advantages of simple preparation and operation, mild reaction conditions, high reaction rate, single product and moderate yield. The photochemical synthesis method is suitable for preparation of various bidentate ligand asymmetrically substituted Fe-Fe hydrogenase mimics.

The invention discloses a catalyst applied to decarbonylation of furfural for preparation of furan, and a preparation method and application thereof. The catalyst comprises an Al2O3 carrier, and a main component Pd and an auxiliary active component Ga-Ga2O3 loaded on the carrier, wherein the auxiliary active component Ga is prepared through partial reduction of Ga2O3; the reduction degree of Ga inGa2O3 is 10-70%; the content of Pd accounts for 0.05 to 0.4 wt% of the total weight of the carrier; and the total content of Ga in the auxiliary active component Ga-Ga2O3 accounts for 0.1-5.0 wt% ofthe total weight of the carrier. The catalyst provided by the invention has high activity and stability in gas-phase decarbonylation of furfural for preparation of furan and is slow in inactivation speed and long in operation period.

The invention provides a hydrodeoxygenation method of bio-oil as well as a catalyst and a preparation method used thereby. The preparation method comprises: contacting a catalyst carrier dipped with active components with an oxygen-containing organic matter during the process of roasting the catalyst carrier dipped with the active components, completing the roasting to obtain an oxidized catalyst; vulcanizing the oxidized catalyst to obtain the product, wherein the active components comprise at least one or more of VIB group metals, one or more of VIII group metals, and one or more of VB group metals. By preprocessing the catalyst with the oxygen-containing organic matter, the selectivity of hydrogenated decarboxylation and decarbonylation reaction is increased; the sulfur fixation performance and thermal stability of the catalyst are improved.

The invention discloses a pyrrolidone compound synthesis method, and belongs to the technical field of organic synthesis. Saturated cyclic tertiary amine 1 is added into solvents, and heating reactionis performed in the presence of oxidizing agent, cupric salt, potassium hydrogen persulfate compound salt (Oxone) and oxygen mixture, additives, elementary iodine or iodated metal salt and the like to obtain pyrrolidone 2. According to the method, a pyrrolidone compound is synthesized by cascade reaction of oxidization retraction, decarbonylation and in-situ oxidization of saturated cyclic tertiary amine compounds, the method has the advantages of simplicity and convenience in operation, mild conditions, wide substrate application range and the like, and an economical, practical, green and environment-friendly novel method is provided for synthesis of the pyrrolidone compound.

The invention discloses a hydrofining catalyst for Fischer-Tropsch oil and a preparation method thereof. The catalyst comprises, by weight, 10 to 40 parts of catalyst active components--(M1)AOB and (M2)COD, 0.05 to 10 parts of a catalyst assistant--(M3)EOF and 0 to 40 parts of a carrier modifier--(M4)GOH, with the balance being a porous carrier--Al2O3, wherein M1 is at least one group-VIII element, M2 is at least one group-VIB element, M3 is at least one group-IA element and/or a group-IIA element, M4 is Ce, Zr, Ti and/or Si, and the atomic ratio (mol ratio) of M1/(M1+M2) is greater than 0.05 but less than 0.30. The catalyst provided by the invention can maintain high olefin saturation and hydrodeoxygenation activity and restrict formation of oxycarbide by restricting decarboxylation and/or decarbonylation, so problems caused by formation of oxycarbide are restricted and hydrodeoxygenation selectivity is optimized.