Abstract:
액상, 기상 및 불균질 수소화 촉매를 포함하는 반응 대역에서 나이트레이트를 수소화시킴을 포함하는, 연속식 공정으로 하이드록실아민을 제조하는 방법으로서, 이 때 상기 반응 대역에서 하이드록실아민 및 아산화질소(N 2 O)가 형성되고, 기상중 아산화질소 농도를 모니터링하고, 반응 대역으로 불균질 수소화 촉매용 촉진제를 제어하면서 첨가하고/하거나 추가량의 불균질 수소화 촉매를 제어하면서 첨가함으로써 기상중 아산화질소 농도를 소정 범위 내로 유지함을 특징으로 하는 방법.
Abstract:
ε-카프로락탐은 고체 촉매 입자를 옥심 포함 가스와 접촉시키기 위해 촉매 층을 유동화하면서 가스 분산판의 다수의 구멍 (평균 직경: 약 3 mm 이하) 을 통해 시클로헥사논 옥심 포함 가스를 고체 촉매 입자의 층에 도입하는 단계를 포함하는 방법으로 얻는다. 상기의 제조 방법으로, 시클로헥사논 옥심 포함 원료 가스로부터 시클헥사논 옥심의 고전화율 및 ε-카프로락탐에 대한 고선택율로 ε-카프로락탐을 제조할 수 있다. ε-카프로락탐
Abstract:
PURPOSE: Provided are a metal ion impregnated porous catalyst and a method for preparing thereof, which is able to increase the yield of a conversion rate of cyclohexanone oxime and ε-caprolactam and provides safe, economical, environmental-friendly and life span extended metal ion, and a method for preparing ε-caprolactam from cyclohexanone oxime using the catalyst. CONSTITUTION: The metal ion impregnated porous catalyst has pores formed by metal oxide pillar introduced between layers of layered silica compound, wherein the metal ion is impregnated in pores. The method comprises steps of (a) synthesizing a layered silica compound; (b) acid-ion exchanging the synthesized layered silica compound by acid titration; (c) forming pores between layers of layered silica compound by adding organic metal to the acid-ion exchanged layered silica compound and sintering; and (d) supporting the surface of the pores in metal ion by adding an aqueous solution of the metal ion thereto and sintering. The ε-caprolactam is prepared by gaseous beckmann conversion of cyclohexanone oxime solution using the metal ion impregnated porous catalyst.
Abstract:
PURPOSE: A method for producing a pentasil type crystalline zeolite having excellent catalytic activity and reproductivity is provided. CONSTITUTION: This method for producing a pentasil type crystalline zeolite comprises (i) compounding a silicon compound with water and tetra-n-propylammonium hydroxide; (ii) obtaining a reaction solution containing a zeolite crystal by hydrothermal reaction from a mixed solution obtained by the 1st step; (iii) separating the reaction solution obtained by the 2nd step into the zeolite crystal and a solution; (iv) baking the zeolite crystal obtained by the 3rd step; and (v) treating the zeolite crystal baked by the 4th step with an aqueous solution containing ammonia and/or ammonium salt and has the molar ratio of hydroxide to silicon of 0.1-0.4 and the molar ratio potassium ion to silicon of 0-0.1 in the mixed solution prepared in the 1st step. This method for producing ε-caprolactam comprises using the pentasil type crystalline zeolite as a catalyst obtained by the method and subjecting cyclohexanone. oxime to Beckmanns rearrangernent reaction under a vapor-phase condition.
Abstract:
PURPOSE: A process for production of lauryllactam which is useful as a monomer for producing a polyamide 12 type polymer is provided by which defects caused by using sulfonic acid in a conventional process can be reduced by using methane sulfonic acid. CONSTITUTION: A process for production of lauryllactam comprises the steps of: reacting acyclododecane, a nitrating agent and a hydrogen chloride which are dissolved in an organic solvent such as a chloroform or a chlorobenzene in the presence of a methane sulfonic acid to give a cyclododecanone oxime; and subjecting the oxime to Beckmann rearrangement in the presence of the methane sulfonic acid to give the objective lauryllactam.