TH10096B - Method for the production of methyl methacrylate - Google Patents

Abstract

The revealed DC60 (14/09/41) is a method for the production of methyl methacrylate, which consists of the oxidation of hisobutylene and/or tert-butanol. by catalyst of the gas phase with Molecular oxygen, wherein to obtain gas (a), consisting of gas, metacrolein and water vapor, conduction gas (a) and liquid mixtures. Methacrolein/Methanol (I) enters the dewatering tower at the bottom of the object. and at the top of that, respectively, whereby the liquid mixture (I) is allowed to flow downward in the dewatering tower. and in countercurrent contact with the gas (a) in the dewatering tower, thereby obtaining a mixture of dewatered gases (b) consisting of metha-crolein gas and methanol gas. The introduction of the dehydrated gas mixture (b) and the liquid mixture of Methacrolein/Methanol (II) into the adsorption tower at the bottom of the object. and at the top of that, respectively, thereby allowing a mixture of liquids (II) to flow downwards and come in contact with Countercurrent with the dewatered gas mixture (b) in the adsorption tower, whereby the liquid metacrolein/methanol mixture (III) and the liquid mixture (III) are obtained. ) enter the reactor and oxidative esterification, which is present in liquid (III) mixtures, undergoes oxidative esterification. in the reactor in the existence of Molecular oxygen and in the presence of palladium catalysts revealed are methods for the production of methyl methacrylate, consisting of: hisobutylene impregnation and/or tert-butylene. Thanol through oxidation reaction by catalyst of the gas phase with Molecular oxygen, wherein to obtain gas (a), consisting of gas, metacrolein and water vapor, conduction gas (a) and liquid mixtures. Methacrolein/Methanol (I) enters the dewatering tower at the bottom of the object. and at the top of that, respectively, whereby the liquid mixture (I) is allowed to flow downward in the dewatering tower. and in countercurrent contact with the gas (a) in the dewatering tower, thereby obtaining a mixture of dewatered gases (b) consisting of metha, colein gas and methanol gas. The introduction of the dehydrated gas mixture (b) and the liquid mixture of Methacrolein/Methanol (II) into the adsorption tower at the bottom of the object. and at the top of that, respectively, thereby allowing a mixture of liquids (II) to flow downwards and come in contact with countercurrent with the dewatered gas mixture (b) in the adsorption tower, thereby obtaining a mixture of liquid methacrolein/methanol(III) and the introduction of liquid(III) mixtures into the reactor and makes the methacrolein and methanol which are present in the liquid mixture(III) ) through the oxidative esterification reaction. in the reactor in the existence of Molecular oxygen and in the presence of palladium catalysts:

Claims (9)

1.Methods for methyl production Methacrylate, which contains: (1) the introduction of at least one starting material It is chosen from a group consisting of isobutylene and tert-butanol. To the oxidation reaction By gas catalyst Phase with oxygen molecules In the presence of a catalyst, whereby To obtain a gas (a) consisting of methacrylene, gas and steam (2) such gas conduction (a) and liquid mixture (I) consisting of liquid methacholein and methanol. Liquefied to the water purification tower at the bottom of that And at the top of that, respectively, that way, it allows the said liquid mixture (I) to flow downward in Such water removal tower And countercurrent contact with the said gas (a) in the said water removal tower. So that the liquid (I) mixture is gasified there to form a gas mixture (I \ ') containing gaseous methacholein. And methanol gas While causing the steam contained in the said gas (a) to be condensed there to produce water in which the produced water is discharged from the bottom of the dehydration tower where that To remove the water of such gas (a) while extracting the derived water (a \ ') gas that contains Methacolein gas Together with the gas mixture (I \ ') as mentioned from the section The top of the water removal tower Such as a dehydrated mixture (b) consisting of Methacrylene, gases and methanol gases (3) conduction gas-displaced mixtures (b) and liquid (II) mixtures consisting of Liquid Methacroin And the liquid methanol enters the adsorption tower at the bottom part of it and at the top, respectively, whereby it allows the liquid mixture (II) to flow downwards. And countercurrent contact with the aforementioned dehydrated gas mixture (b) in the adsorption tower, where the liquid mixture (II) is introduced in sufficient quantities to absorb the metha. Gas chromatography And methanol gas Where virtually all such dewatering gas mixtures (b) exist So cause The methacrolein, gases and methanol gases of all such water-depleted gas mixtures (b) are virtually identical. It is then absorbed into the liquid (II) mixture, whereby to obtain a liquid (III) mixture consisting of liquid methacholein and liquid methanol. This is followed by the suction of the liquid (III) mixture from the bottom of the adsorption tower and (4) the introduction of the liquid mixture (III), which was sucked into. Oxidative esterification reactor And the use of methacrolene and methanol contained in the said liquid (III) mixtures to oxidative esterification. In such reactors the presence of oxygen molecules And in the presence of a palladium catalyst, whereby to produce methyl methacrylate in the form of reaction mixtures. Which contains methyl methacrylate, water, methacrylate and methanol. 2. Methods for compliance with claim 1, in which at least one of the substances Mix of liquid It was chosen from a group consisting of (I) and (II) liquid mixtures. These are liquid (IV) mixtures consisting of Liquid Methacroin And liquid methanol where such liquid (IV) mixtures are obtained by separation from the aqueous mixture obtained by oxidative reactions. Such esterification 3. The method for compliance with claim 1 or 2, where the exposure of the aforementioned liquid (I) mixtures with the said gas (a) in such removal tower is carried out at temperature from 10 to 60 ํ C under pressure from 0.2 to 3.0 kg / cm2. 4. Methods for compliance with any clause. Of claims 1 to 3 where the exposure of the said liquid (II) mixture to the said dehydrated gas mixture (b) in the adsorption tower is carried out at temperature from -25 to 10 ํ C under pressure from 0.2 to 3.0 kg / cm2. 5. Methods for compliance with any clause. Of claim 1 to 4 where the said liquid mixture (I) is introduced into The water removal tower in volumes from 10 to 500 g per Nm3 (where Nm3 means m3 as measured at 0 ํ C under 1 atm) of such gas (a). 6. Methods for compliance with any clause. Of claims 1 to 5 where the liquid (II) mixture is introduced into the adsorption tower in quantities from 50 to 1000 g per Nm3 (where Nm3 means m3, as Measured at 0 ° C under 1 atm) of the degassed gas mixture (b). 7.Methods for compliance with any clause. Clause 1 to 6, where each of the aforementioned liquid (I) and (II) mixtures is independently composed of liquid methachroolin and liquid methanol in an amount of 5 to 60. % By wt and 40 to 95% wt, which is based on the respective weight of the aforementioned liquid (I) and (II) mixtures. 8. Methods for compliance with any clause. Of claim 2 to 7, where the aforementioned liquid (IV) mixture also contains methyl methacrylate in an amount not exceeding 25% by weight, depending on the weight of the Liquid (IV) mixtures thereof 9. Methods for compliance with any clause. Of Clause 1 to 8, where the available content of liquid methachrolene In liquid (III) mixtures, it is from 25 to 69% by weight, depending on the weight of the said liquid (III) mixture and the weight ratio of Liquid methacryline to liquid methanol in such liquid (III) mixtures is 0.33 to 2.2.