37 results about "3-methyl-2-buten-1-ol" patented technology

The invention relates to a production method of a C5 enol. The production method uses isoprene and hydrogen chloride as raw materials and comprises the following steps: 1) performing addition reaction on isoprene and hydrogen chloride to generate a mixture of 1-chloro-isopentene and 3-chloro-isopentene; and 2) performing a hydrolysis reaction on the product of the addition reaction, adding one or more of toluene, ethylbenzene, n-hexane, cyclohexane, 2-methylpentane, 3-methylpentane, 2,2-dimethylbutane, 2,3-dimethylbutane and heptane as the solvent in the hydrolysis process, separating out the oil phase product after the hydrolysis, and rectifying to obtain products, namely methylbutenol and 3-methyl-2-buten-1-ol. Compared with the C5 enol production process of the prior art, the side reaction, in which dichloro-isopentane is generated, in the addition reaction process is effectively inhibited; after the solvent is added in the hydrolysis reaction, the yield of the hydrolysis reaction can be increased and the purification of the product can be facilitated; the yields of the addition reaction and the hydrolysis reaction are both more than 98% and are obviously increased as compared with the prior art; and the production cost is greatly reduced.

The present invention provides a novel biosynthetic pathway for the production of isoprene from 3-methyl-2-buten-1-ol or 2-methyl-3-buten-2-ol. Further embodiments provide non-naturally occurring microorganism that have been modified to produce isoprene from 3-methyl-2-buten-1-ol or 2-methyl-3-buten-2-ol and methods of producing isoprene using said microorganism.

The invention provides for a method for producing a 5-carbon alcohol in a genetically modified host cell. In one embodiment, the method comprises culturing a genetically modified host cell which expresses a first enzyme capable of catalyzing the dephosphorylation of an isopentenyl pyrophosphate (IPP) or dimethylallyl diphosphate (DMAPP), such as a Bacillus subtilis phosphatase (YhfR), under a suitable condition so that 5-carbon alcohol is 3-methyl-2-buten-1-ol and / or 3-methyl-3-buten-1-ol is produced. Optionally, the host cell may further comprise a second enzyme capable of reducing a 3-methyl-2-buten-1-ol to 3-methyl-butan-1-ol, such as a reductase.

The present invention relates to a method for producing 3-methyl-2-butenyl acetate which comprises reacting 3-methyl-2-buten-1-ol with acetic anhydride in the presence of an inorganic base catalyst and a method for producing purified 3-methyl-2-butenyl acetate which comprises subjecting crude 3-methyl-2-butenyl acetate to a step (A) of contacting it with an aqueous solution of an alkali metal hydrogen sulfite, or a step (B) of contacting it with an aqueous solution of a base, or both steps (A) and (B).

The invention relates to a method for preparing 3-methyl-2-buten-1-ol through a transesterification reaction of isopentenyl acetate. The method is characterized in that a transesterification reactionis catalyzed by adopting a solid acid catalyst. The solid acid catalyst is one or more selected from the following components: a composite oxide consisting of ceric oxide and one or two selected fromsilicon dioxide and aluminum trioxide, and a supported noble metal catalyst taking one or more selected from the composite oxide and ceric oxide as a carrier, wherein the noble metal component is oneor more selected from iridium, gold and rhodium, the supported noble metal catalyst contains or does not contain an auxiliary agent, and the auxiliary agent is one or two selected from iron or cobalt.According to the synthetic method adopted by the invention, under the catalysis of the prepared solid acid catalyst, the 3-methyl-2-buten-1-ol can be generated through high-conversion-rate high-selectivity transesterification of isopentenyl acetate and methanol under a certain pressure and temperature.

The invention provides a heterogeneous catalyst and a preparation method thereof as well as a method for preparing 3-methyl-2-butene-1-ol in the presence of the catalyst. The heterogeneous catalyst comprises a carrier and three components on the carrier, wherein the first component is selected from one or two or several in palladium, gold, platinum, nickel, chromium and molybdenum; the second component is selected from one or two or several in elements of groups IIIA, IVA and VA; the third component is selected from one or two or several in lanthanide elements. The preparation method comprises the step of performing a reactive distillation process on 3-methyl-3-butene-1-ol to prepare the 3-methyl-2-butene-1-ol in the presence of the heterogeneous catalyst. According to the method provided by the invention, the yield and selectivity of the 3-methyl-2-butene-1-ol can be obviously improved, and the stability of the catalyst is improved, so that the production cost is reduced.

The invention discloses a preparation method for enabling 3-methyl-2-butene-1-alcohol to be synthesized into a 3-methylcrotonaldehyde catalyst. The preparation method for enabling 3-methyl-2-butene-1-alcohol to be synthesized into the 3-methylcrotonaldehyde catalyst comprises the steps that firstly a certain proportion of a copper-silicon carrier is prepared by a gel method, and then active component molybdenum and ruthenium are loaded by a certain ratio by a dipping method, and the mixture is dried, calcined and shaped to obtain the catalyst. The catalyst is charged to a fixed bed reactor foractivation. Feeding and reaction are carried out, it is verified that the catalyst has a conversion rate of up to 80% and selectivity of up to 99% for the synthesis of 3-methyl-2-butene-1-alcohol into 3-methylcrotonaldehyde, the catalyst can be used for reaction without air and oxygen, the catalyst is long in service life and low in cost, and continuous production and environmental protection areachieved.

The present invention provides a novel biosynthetic pathway for the production of isoprene from 3-methyl-2-buten-1-ol or 2-methyl-3-buten-2-ol. Further embodiments provide non-naturally occurring microorganism that have been modified to produce isoprene from 3-methyl-2-buten-1-ol or 2-methyl-3-buten-2-ol and methods of producing isoprene using said microorganism.

The invention provides a washable coating material and a preparation method thereof. The coating material comprises the following components by weight percentage: 20-25% of titaniferous microcrystalline cellulose composite powder, 12-16% of slag powder, 0.15-0.2% of polyurethane, 2-5% of titanium dioxide, 0.1-0.5% of silica sol, 3-5% of silica powder and the balance of 3-methyl-2-butylene-1-alcohol acetate composite solution, wherein the slag powder comprises the following components by weight percentage: 36-40% of CaO, 13-15% of Al2O3, 6-9% of MgO, 0.3-0.5% of FeO and the balance of SiO2; the particle size of the slag powder is 80-100 micrometers; the fineness of titanium dioxide is 80-100 micrometers; the particle size of the titaniferous microcrystalline cellulose composite powder is 80-100 nanometers; and the particle size of the silica powder is 0.5-0.8 millimeters.

The invention provides a preparation method of a carbon / carbon composite material HfB2 anti-oxidation outer coating. The preparation method comprises the following steps of dispersing HfB2 powder in 3-methyl-2-buten-1-ol, performing ultrasonic oscillation and stirring to obtain a suspension A; adding an iodine elementary substance into the suspension A, performing ultrasonic oscillation and stirring to obtain a solution B; pouring the solution B into a device which takes a graphite electrode as an anode, takes a conductive matrix as a cathode, fixes the cathode on a rotating body and can rotate under the drive of a motor, wherein the cathode and anode of the device are connected with two corresponding electrodes of a constant-current power supply; then clamping a C / C composite material test sample with a SiC inner coating on the cathode in the device, placing the device into a constant-temperature oven, and closing the power supply of the device and the oven after the end of the reaction; opening the device, taking out the test sample and then drying to obtain the carbon / carbon composite material HfB2 anti-oxidation outer coating. The carbon / carbon composite material HfB2 anti-oxidation outer coating has no cracks on the surface and great bonding strength of the coating; the process is simple, raw materials are easy to obtain, and the preparation cost is relatively low.

The present invention relates to a method for producing 3-methyl-2-butenyl acetate which comprises reacting 3-methyl-2-buten-1-ol with acetic anhydride in the presence of an inorganic base catalyst and a method for producing purified 3-methyl-2-butenyl acetate which comprises subjecting crude 3-methyl-2-butenyl acetate to a step (A) of contacting it with an aqueous solution of an alkali metal hydrogen sulfite, or a step (B) of contacting it with an aqueous solution of a base, or both steps (A) and (B).

The present invention discloses an unsaturated acetal preparation method. According to the preparation method, an unsaturated alcohol and an unsaturated aldehyde are subjected to a reaction in a pre-reactor to achieve a thermodynamic equilibrium, and then enter a tower type reactor, a water carrying agent is subjected to gasification through a gas generator, and then is subjected to reverse contact with a reaction liquid, and the water generated from the reaction is removed, such that the unsaturated alcohol and the unsaturated aldehyde are subjected to a continuous condensation reaction to prepare the unsaturated acetal. The preparation method has the following characteristics that: the method can be performed under a normal pressure condition, the reaction temperature is constant, low cost synthesis of the unsaturated acetal can be achieved, particularly 3-methyl-2-buten-1-ol and 3-methyl-2-butenal can be adopted as raw materials to synthesize 3-methyl-2-butenal-1 diisopentenyl acetal, wherein the compound is an important intermediate of a synthetic perfume citral.

The invention provides a process for synthesizing deca-isoprene alcohol comprises, in the mixed solvent of tetrahydrofuran and dimethyl formamide, using tert-butanol potassium as alkaline reagent, and using sodium iodide or sodium bromide as halogen exchanger, condensing nicotine based sulfone with 4-chlorin-3-methyl-2-butylene-1-alcohol acetic acid ester, thus obtaining 5-sulfuryl deca-isoprene alcohol acetic acid ester, removing sulfuryl in methylamine by using lithium, thus preparing destination product deca-isoprene alcohol.