Synthesizing method of 2-methallyl alcohol

Abstract

The invention discloses a synthesizing method of 2-methallyl alcohol, comprising the following steps of: sequentially adding water, solid base, 2-methallyl chloride and polyethylene glycol to a reaction vessel, then refluxing by heating, and dripping an aqueous alkali solution with the concentration of 1-50 percent; (2) after reaction is completed, cooling, standing and demixing a reaction solution to obtain an organic layer and a water layer, drying and dewatering the organic layer, decoloring by activated carbon, filtering to obtain a target product, and circularly using filter liquor obtained by filtering and desalting the water layer as a new reaction solvent for preparing the 2-methallyl alcohol; and (3) adding the 2-methallyl chloride to the circularly used reaction solvent, and complementally adding the polyethylene glycol, the water and the base to perform new reaction for preparing the 2-methallyl alcohol, wherein the filter liquor obtained by filtering the water layer in each reaction is always circularly used as a next new reaction solvent. The synthesizing method of the 2-methallyl alcohol has the advantages of low production cost, high target product yield, low energyconsumption and little pollution.

Description

technical field [0001] The present invention relates to a kind of synthetic method of 2-methallyl alcohol. Background technique [0002] 2-methallyl alcohol (also known as 2-methallyl alcohol, isobutenol or methallyl alcohol) is an important intermediate, widely used in polymer monomers, surfactants and other fields. Generally adopt hydrolysis to prepare 2-methallyl alcohol, the earliest method appears in Sheshukov et al published, J Russ. Later, there are many improved methods on this basis, such as: [0003] US2072015 proposes hydrolysis at 120°C, under the catalysis of sodium hydroxide or sodium carbonate, at 5 atmospheres; this synthesis method needs to realize the reaction under high pressure conditions, and has high requirements for equipment. [0004] US2323781 uses electrolytic copper to assist the hydrolysis of potassium carbonate; the production cost of this method is relatively high, and the reaction process will produce difficult-to-treat copper-containing wast...

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Problems solved by technology

[0004] US2323781 uses electrolytic copper to assist the hydrolysis of potassium carbonate; the production cost of this method is relatively high, and the reaction process will produce difficult-to-treat copper-containing wastewater

[0005] US2313767 proposes to hydrolyze under the presence of surfactant pulling powder such as sodium naphthyl sulfonate. This production method needs to use relatively high price pulling powder such as sodium naphthyl sulfonate, which increases the production cost and the target product yield lower

[0006] JP2009107949 uses DMF to promote hydrolysis in order to avoid the use of heavy metal catalysts. The reaction process will introduce difficult-to-handle DMF solvents, causing certain pollution to the environment

[0007] In addition, Schale et al. in Chemische Berichte., vol.70; (1937); p.116, 121 proposed to use potassium hydroxide to catalyze hydrolysis, the side reaction in this method is mainly serious etherification, resulting in lower yield of target product

[0008] In the above methods, there are generally large amounts of alkali, water or organic solvents, and it is difficult to recycle, which also leads to high production costs, low yields, high energy consumption, and large pollution.

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