Cyanohydrins (α-hydroxy nitriles) are a special type of nitriles that readily decompose into hydrogen cyanide (HCN) and the corresponding carbonyl compounds. Hydration of cyanohydrins that are readily available through cyanation of aldehydes and ketones provides the most straightforward route to valuable α-hydroxyamides. However, due to low stability of cyanohydrins and deactivation of the catalysts
METHOD FOR PRODUCING A CARBOXYLIC ACID AMIDE FROM A CARBONYL COMPOUND AND HYDROCYANIC ACID
申请人:May Alexander
公开号:US20110306784A1
公开(公告)日:2011-12-15
The invention relates to a method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid, comprising the steps of A) reacting a carbonyl compound with hydrocyanic acid to produce a hydroxycarboxylic acid nitrile, B) hydrolysis of the hydroxycarboxylic acid nitrile obtained in step A) in the presence of a catalyst comprising manganese dioxide, wherein a molar excess of carbonyl compound is used in relation to the hydrocyanic acid to react the carbonyl compound with hydrocyanic acid according to step A), and the reaction mixture obtained in step A) is not purified by distillation before the hydrolysis according to step B) is carried out. The invention furthermore relates to a method for producing alkyl(meth)acrylates from polymers, moulding compounds and moulded bodies, wherein a method for producing a carboxylic acid amide from a carbonyl compound and hydrocyanic acid is carried out in accordance with the method described above.
Process for producing alpha-hydroxycarboxylic acid amide
申请人:Mitsubishi Gas Chemical Company, Inc.
公开号:US04950801A1
公开(公告)日:1990-08-21
Disclosed is a process for producing .alpha.-hydroxy-carboxylic acid amide represented by the formula (I): ##STR1## wherein R.sup.1 and R.sup.2 are as defined in the specification, by a catalytic hydration reaction of cyanohydrin represented by the formula (II): ##STR2## which comprises using a modified manganese dioxide containing one or more of an alkali metal element and an alkaline earth element in an amount of 0.05 to 0.5 based on the manganese element in terms of atomic ratio.
METHOD FOR PRODUCING A-HYDROXYISOBUTYRIC ACID AMIDE AND REACTOR
申请人:MITSUBISHI GAS CHEMICAL COMPANY, INC.
公开号:US20160145196A1
公开(公告)日:2016-05-26
The present invention provides a method for producing α-hydroxyisobutyric acid amide by hydration of acetone cyanohydrin under the presence of a catalyst composed mainly of manganese oxide using a reactor in which at least two reaction regions are connected in series, the method being characterized by comprising: a step (B) of cyclically supplying at least a portion of a reaction liquid withdrawn from at least one reaction region to a first reaction region (I) in the reactor; and a step (b1) of further cyclically supplying at least a portion of the reaction liquid withdrawn from at least one reaction region to at least one reaction region other than the first reaction region. The method is also characterized in that an oxidizing agent is supplied to at least one reaction region in the reactor.
Integrated method for producing methyl methacrylate and hydrogen cyanide
申请人:Mitsubishi Gas Chemical Company, Inc.
公开号:US06075162A1
公开(公告)日:2000-06-13
A method of producing methyl methacrylate comprises Step 1 of producing acetone cyanhydrin from hydrogen cyanide and acetone; Step 2 of producing .alpha.-hydroxyisobutyramide by hydrating acetone cyanhydrin; Step 3 of producing methyl .alpha.-hydroxyisobutyrate and ammonia by a reaction of .alpha.-hydroxyisobutyramide and methanol; Step 4 of producing methyl methacrylate by dehydrating methyl .alpha.-hydroxyisobutyrate; and Step 5 of producing hydrogen cyanide in vapor phase by reacting methanol and the ammonia obtained in Step 3 over a solid catalyst in the presence of molecular oxygen. By using methanol in the step 3, the conversion ratio of .alpha.-hydroxyisobutyramide into methyl .alpha.-hydroxyisobutyrate can be increased because the equilibrium of the reaction is easily sifted toward the product side by removing ammonia being produced from the reaction system. The use of methanol in the step 3 produces additional advantages of efficiently linking the steps to eliminate the steps for separation and purification, thereby reducing the production cost. Step 1: HCN+CH.sub.3 COCH.sub.3 .fwdarw.(CH.sub.3).sub.2 (OH)CN; Step 2: (CH.sub.3).sub.2 C(OH)CN+H.sub.2 O.fwdarw.(CH.sub.3).sub.2 (OH)CONH.sub.2 Step 3: (CH.sub.3).sub.2 C(OH)CONH.sub.2 +CH.sub.3 OH.fwdarw.(CH.sub.3).sub.2 (OH)CO.sub.2 CH.sub.3 +NH.sub.3 Step 4: (CH.sub.3).sub.2 C(OH)CO.sub.2 CH.sub.3 .fwdarw.(CH.sub.2).sub.2 .dbd.C(CH.sub.3)CO.sub.2 CH.sub.3 +H.sub.2 O Step 5: CH.sub.3 OH+NH.sub.3 +O.sub.2 .fwdarw.HCN+3H.sub.2 O