Process for the simultaneous production of 1,2- and 1,3-propanediol
    2.
    发明授权
    Process for the simultaneous production of 1,2- and 1,3-propanediol 失效
    同时生产1,2-和1,3-丙二醇的方法

    公开(公告)号:US5426249A

    公开(公告)日:1995-06-20

    申请号:US151389

    申请日:1993-11-12

    摘要: A process is described for the simultaneous production of 1,2- and 1,3-propanediol from glycerol. The process involves the reaction stages (a) dehydration of glycerol by feeding a gaseous glycerol-water mixture with 10 to 40 wt % glycerol at 250.degree. to 340.degree. C. over a solid catalyst with an H.sub.0 value (Hammett acidity function) of less than 2, preferably between -3 and -8.2, (b) hydration of the acrolein contained in the reaction mixture of stage (a), and (c) catalytic hydrogenation of the reaction mixture, containing 3-hydroxypropionaldehyde and hydroxyacetone, of stage (b). Two valuable products, namely 1,2- and 1,3-propanediol, can be obtained simultaneously and in high total yield from glycerol in a simple process.

    摘要翻译: 描述了从甘油同时生产1,2-和1,3-丙二醇的方法。 该方法包括反应阶段(a)通过在250℃至340℃下通过在H 2值(哈米特酸度函数)较小的固体催化剂上加入含有10至40重量%甘油的气态甘油 - 水混合物来脱水甘油 (b)使步骤(a)的反应混合物中所含的丙烯醛水合,(c)含有3-羟基丙醛和羟基丙酮的反应混合物的催化氢化 b)。 两个有价值的产物,即1,2-和1,3-丙二醇,可以在一个简单的过程中同时获得,并以高的总收率由甘油获得。

    Process for the production of acrolein
    7.
    发明授权
    Process for the production of acrolein 失效
    丙烯醛生产工艺

    公开(公告)号:US5387720A

    公开(公告)日:1995-02-07

    申请号:US151390

    申请日:1993-11-12

    IPC分类号: C07B61/00 C07C45/52 C07C47/22

    CPC分类号: C07C45/52

    摘要: A process for the production of acrolein by dehydration of glycerol in the liquid phase or in the gaseous phase, in each case on acidic solid catalysts, is described. Compared with previously known processes, the space-time yield and catalyst service life may be surprisingly increased with higher selectivity by treating a glycerol-water mixture with a glycerol content of 10 to 40 wt. % at 180.degree. to 340.degree. C. (liquid phase) or at 250.degree. to 340.degree. C. (gaseous phase) on a solid catalyst with an H.sub.o value (Hammett acidity function) of less than +2, preferably less than -3.

    摘要翻译: 描述了通过在液相或气相中,在各种情况下在酸性固体催化剂上脱水甘油来生产丙烯醛的方法。 与先前已知的方法相比,通过用甘油含量为10-40重量%的甘油 - 水混合物处理,通过更高的选择性可以惊人地增加时空产率和催化剂使用寿命。 在180℃至340℃(液相)下或在250℃至340℃(气相)下,在Ho值(哈米特酸度函数)小于+2,优选小于-3的固体催化剂上 。

    Process for producing L-carnitine from D,L-carnitine nitrile salts
    8.
    发明授权
    Process for producing L-carnitine from D,L-carnitine nitrile salts 失效
    从D,L-CARNITINE NITRILE SALTS生产L-酪氨酸的方法

    公开(公告)号:US5166426A

    公开(公告)日:1992-11-24

    申请号:US858492

    申请日:1992-03-27

    CPC分类号: C07C227/34

    摘要: Synthesis of L-carnitine by chemical optical resolution of D,L-carnitine nitrile salts, where the D,L-carnitine nitrile salt is reacted with optically active N-acetylproline as the resolving agent in order to form the diastereomer salts after conversion to the hydroxide form, one of the two diastereomer salts is separated by fractional crystallization and the fraction containing mainly L-carnitine nitrile salt is treated with an optically inactive strong acid in order to split off the optically active N-acetylproline and then the resolving agent is separated and the resulting L-carnitine nitrile salt is saponified to L-carnitine. N-acetyl-L-proline is used as the resolving agent and the diastereomer (LL) salt is obtained in crystalline form in a high optical purity by fractional crystallization and the L-carnitine nitrile salt obtained after splitting off and separating N-acetyl-L-proline is used directly for saponification without further crystallization.

    摘要翻译: 通过化学光学拆分D,L-肉碱腈盐合成左旋肉碱,其中D,L-肉毒碱腈与光学活性N-乙酰脯氨酸作为拆分剂反应,以便在转化为 氢氧化物形式,通过分级结晶分离两种非对映异构体盐中的一种,并且用光学惰性的强酸处理主要含有L-肉碱腈盐的级分,以便分离光学活性N-乙酰脯氨酸,然后分离出拆分剂 并将所得的L-肉碱腈盐皂化成L-肉毒碱。 使用N-乙酰基-L-脯氨酸作为拆分剂,通过分级结晶以高光学纯度获得结晶形式的非对映异构体(LL)盐,分解N-乙酰基-L-脯氨酸后得到的L-肉碱腈盐, L-脯氨酸直接用于皂化而不进一步结晶。

    Process for the production of 2-amino-5-mercapto-1,3,4-thiadiazole
    9.
    发明授权
    Process for the production of 2-amino-5-mercapto-1,3,4-thiadiazole 失效
    2-氨基-5-巯基-1,3,4-噻二唑的制备方法

    公开(公告)号:US4492793A

    公开(公告)日:1985-01-08

    申请号:US408131

    申请日:1982-08-13

    申请人: Herbert Klenk

    发明人: Herbert Klenk

    CPC分类号: C07D285/135

    摘要: 2-Amino-5-mercapto-1,3,4-thiadiazoles can be produced in very high yields from thiosemicarbazides and carbon disulfide in aqueous phase by working in the presence of the corresponding ammonium salt of bis-2,5-mercapto-1,3,4-thiadiazole at a temperature above 40.degree. C. Preferably the process is carried out in the presence of the mother liquor from a previous reaction.

    摘要翻译: 2-氨基-5-巯基-1,3,4-噻二唑可以通过在相应的双-2,5-巯基-1的铵盐存在下,从硫代氨基脲和二硫化碳在水相中以非常高的产率制备 ,3,4-二噻二唑在40℃以上的温度下进行。优选地,该方法在来自先前反应的母液的存在下进行。