- Preparation method of vinyl isobutyl ether
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The invention relates to the field of chemical engineering, and provides a preparation method of vinyl isobutyl ether. The preparation method comprises the following steps: pretreatment of a catalyst, preparation of acetylene gas, synthesis reaction and the like. According to the method, the vinyl isobutyl ether is prepared through an addition reaction in an anhydrous environment of acetylene gas and isobutanol under the action of the catalyst, and the method is simple in principle, short in process step, mild in reaction condition and high in safety, and is a promising method for industrially producing the vinyl isobutyl ether.
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Paragraph 0018; 0025; 0032; 0038-0079
(2021/07/28)
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- Calcium Carbide Looping System for Acetaldehyde Manufacturing from Virtually any Carbon Source
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A vinylation/devinylation looping system for acetaldehyde manufacturing was evaluated. Vinylation of iso-butanol with calcium carbide under solvent-free conditions was combined with hydrolysis of the resulting iso-butyl vinyl ether under slightly acidic conditions. Acetaldehyde produced by hydrolysis was collected from the reaction mixture by simple distillation, and the remaining alcohol was redirected to the vinylation step. All the inorganic co-reagents can be looped as well, and the full sequence is totally sustainable. A complete acetaldehyde manufacturing cycle was proposed on the basis of the developed procedure. The cycle was fed with calcium carbide and produced the aldehyde as a single product in a total preparative yield of 97 %. No solvents, hydrocarbons, or metal catalysts were needed to maintain the cycle. As calcium carbide in principle can be synthesized from virtually any source of carbon, the developed technology represents an excellent example of biomass and waste conversion into a valuable industrial product.
- Rodygin, Konstantin S.,Lotsman, Kristina A.,Ananikov, Valentine P.
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p. 3679 - 3685
(2020/06/17)
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- Preparation method of isobutyl vinyl ether
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The invention provides a preparation method of isobutyl vinyl ether and relates to isobutyl vinyl ether. An isobutyl alcohol solution containing a catalyst is pumped into a circulation flow reactor from the bottom of a lifting pipe through a metering pump, and mixed gas of acetylene and nitrogen gas enters a gas ejector from the bottom of the lifting pipe after passing through a gas buffer tank, a compressor and absorption and drying columns; materials are driven to flow into a downcomer from the upper portion of the lifting pipe and recycled and flow back to the lifting pipe after heat exchange conducted by a heat exchanger and conduction oil, sprayed-out micro bubbles are mixed with and contact with an isobutanol solution, a reaction is conducted, and a reaction mixture is obtained, the reaction mixture flows out of an outlet in the top of the lifting pipe and enters a gas-liquid separator for gas-liquid separation after being cooled by a cooler, the gas phase flows out of the top of the gas-liquid separator and is recycled to the gas buffer tank after being subjected to decompression with a decompressor, and liquid flowing out of the gas-liquid separator is the isobutyl vinyl ether. Mass transfer is good in heat transfer effect, a device is simple in structure, safe, efficient, easy to operate, low in cost and prone to industrialization.
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Paragraph 0029-0037
(2018/02/04)
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- PROCESS FOR PRODUCTION OF ALKENYL ETHERS
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A process for the production of alkenyl ethers represented by the general formula (III) [wherein R1, R2 and R3 are each independently hydrogen, substituted or unsubstituted alkyl, or the like; n is an integer of 1 or above; and X is a group derived from substituted or unsubstituted alkane by removing n hydrogen atoms (which alkane includes those substituted with one or two aryl groups and the carbon atoms of which alkane may be partially replaced by oxygen or SO2), or the like], characterized by comprising the step of reacting a compound represented by the general formula (I) (wherein R1, R2 and R3 are each as defined above) with a compound represented by the general formula (II) (wherein n and X are each as defined above) and hydrogen halide to obtain an α-halo ether.
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Page/Page column 9-10
(2008/06/13)
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- Nucleophilic addition to acetylenes in superbasic catalytic systems: XIII. Fluoride cesium containing systems, efficient catalysts for alkanols vinylation
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New catalytic systems CsF-MOH (M = Li, Na) were developed for the synthesis of alkyl vinyl ethers comparable in efficiency to cesium alcoholates. The addition of primary and secondary alcohols to acetylene occurs in the presence of these systems at the atmospheric (DMSO, 100°C) or at enhanced (without solvent, 135-140°C) acetylene pressure and affords alkyl vinyl ethers in up to 93% yield. 2005 Pleiades Publishing, Inc.
- Oparina,Shaikhudinova,Parshina,Vysotskaya,Preiss,Henkelmann,Trofimov
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p. 656 - 660
(2007/10/03)
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