Preparation of poloxy-alkylene glycols
    53.
    发明授权
    Preparation of poloxy-alkylene glycols 失效
    烷氧基 - 亚烷基二醇的制备

    公开(公告)号:US5416240A

    公开(公告)日:1995-05-16

    申请号:US24903

    申请日:1993-03-02

    CPC分类号: C08G65/20

    摘要: Polyoxyalkylene glycols are prepared by a process in which tetrahydrofuran is polymerized with a total of not more than 95 mol %, based on the amount of tetrahydrofuran used, of one or more comonomers from the group consisting of the cyclic ethers and acetals in the absence of water and in the presence of a monohydric alcohol or of a monocarboxylic acid with the aid of an anhydrous heteropoly acid catalyst, and the polyoxyalkylene glycol is liberated from the resulting polyoxyalkylene glycol monoethers or polyoxyalkylene glycol monoesters by cleavage of the monoether or monoester bond.

    摘要翻译: 聚氧亚烷基二醇通过以下方法制备,其中四氢呋喃基于所用四氢呋喃的总量不超过95摩尔%,在不存在共聚单体的情况下聚合来自由环醚和缩醛组成的组中的一种或多种共聚单体 水和一元醇或单羧酸存在下,借助于无水杂多酸催化剂,通过裂解单醚或单酯键,从所得聚氧亚烷基二醇单醚或聚氧亚烷基二醇单酯中释放出聚氧亚烷基二醇。

    3-substituted 2-hydroxy-3-formylpropionic esters, the preparation
thereof and the use thereof for preparing 3-substituted 3-formylacrylic
esters
    54.
    发明授权
    3-substituted 2-hydroxy-3-formylpropionic esters, the preparation thereof and the use thereof for preparing 3-substituted 3-formylacrylic esters 失效
    3-取代的2-羟基-3-甲酰基丙酸酯,其制备及其用于制备3-取代的3-甲酰基丙烯酸酯的用途

    公开(公告)号:US5256813A

    公开(公告)日:1993-10-26

    申请号:US883342

    申请日:1992-05-15

    IPC分类号: C07C69/675 C07C69/732

    CPC分类号: C07C69/675

    摘要: A 3-substituted 2-hydroxy-3-formylpropionic ester of the formula I ##STR1## where R.sup.1 is lower alkyl, and R.sup.2 is straight-chain or branched alkyl of 1 to 10 carbon atoms, is obtained by adding an alkanal of the fomrula II ##STR2## and an alkyl glyoxylate of the formula III ##STR3## simultaneously to a catalyst system composed of a salt or a mixture of a secondary amine and a carboxylic acid in such a way that the temperature does not exceed 90.degree. C., preferably 80.degree. C., or else adding one of the reactants of the formula II or III to a mixture of the catalyst system described above and the other reactant in such a way that the temperature does not exceed 90.degree. C. The 2-hydroxy-3-formylpropionic eater of the formula I can be converted by treatment with dehydrating agents, especially acetic anhydride, into good yields of the corresponding 3-substituted 3-formylacrylic ester.

    摘要翻译: 其中R1是低级烷基,R2是具有1-10个碳原子的直链或支链烷基的式Ⅰ的3-取代的2-羟基-3-甲酰基丙酸酯是通过将烷基 的II型和式III(III)的烷基乙醛酸盐同时与由仲胺和羧酸的盐或混合物组成的催化剂体系,使得 温度不超过90℃,优选80℃,或者将一种式II或III的反应物加入到上述催化剂体系和另一种反应物的混合物中,使得温度不 超过90℃。式I的2-羟基-3-甲酰基丙酸酯可以通过用脱水剂,特别是乙酸酐处理转化成相应3-取代的3-甲酰基丙烯酸酯的良好产率。

    3-substituted 2-hydroxy-3-formylpropionic esters, the preparation
thereof and the use thereof for preparing 3-substituted 3-formylacrylic
esters
    55.
    发明授权
    3-substituted 2-hydroxy-3-formylpropionic esters, the preparation thereof and the use thereof for preparing 3-substituted 3-formylacrylic esters 失效
    3-取代的2-羟基-3-甲基丙烯酸酯,其制备方法及其用于制备3-取代的3-甲基丙烯酸酯的用途

    公开(公告)号:US5202461A

    公开(公告)日:1993-04-13

    申请号:US593891

    申请日:1990-10-05

    CPC分类号: C07C69/675

    摘要: A 3-substituted 2-hydroxy3-formylpropionic ester of the formula I ##STR1## where R.sup.1 is lower alkyl, and R.sup.2 is straight-chain or branched alkyl of 1 to 10 carbon atoms, is obtained by adding an alkanal of the formula II ##STR2## and an alkyl glyoxylate of the formula III ##STR3## simultaneously to a catalyst system composed of a salt or a mixture of a secondary amine and a carboxylic acid in such a way that the temperature does not exceed 90.degree. C., preferably 80.degree. C., or else adding one of the reactants of the formula II or III to a mixture of the catalyst system described above and the other reactant in such a way that the temperature does not exceed 90.degree. C. The 2-hydroxy-3-formylpropionic ester of the formula I can be converted by treatment with dehydrating agents, especially acetic anhydride, into good yields of the corresponding 3-substituted 3-formylacrylic ester.

    摘要翻译: 通过加入式I的3-取代的2-羟基-3-甲酰基丙酸酯,其中R 1是低级烷基,R 2是1-10个碳原子的直链或支链烷基, 式II(II)和式III(III)的烷基乙醛酸盐同时加入由盐或仲胺和羧酸的混合物组成的催化剂体系,使得温度 不超过90℃,优选80℃,或者将一种式II或III的反应物加入到上述催化剂体系和另一种反应物的混合物中,使得温度不超过90℃ 式I的2-羟基-3-甲酰基丙酸酯可以通过用脱水剂,特别是乙酸酐处理转化成相应3-取代的3-甲酰基丙烯酸酯的良好产率。

    Preparation of cyclopentanones
    56.
    发明授权
    Preparation of cyclopentanones 失效
    环戊酮的制备

    公开(公告)号:US5166447A

    公开(公告)日:1992-11-24

    申请号:US776688

    申请日:1991-10-15

    摘要: Cyclopentanones of the general formula I ##STR1## where R.sup.1 and R.sup.2 are each an organic radical or R.sup.1 or R.sup.2 may be hydrogen and R.sup.3 is hydrogen or formyl, are prepared by a process in which a 2-formyl-3,4-dihydropyran of the general formula II ##STR2## where R.sup.1 and R.sup.2 have the abovementioned meanings, a) where R.sup.3 is formyl, is converted in the presence of an acidic heterogeneous catalyst at from 50.degree. to 500.degree. C., andb) where R.sup.3 is hydrogen,b.sub.1) is reacted with water or an alcohol in the presence of an acidic heterogeneous catalyst at from 100.degree. to 500.degree. C. in the gas phase orb.sub.2) a compound II or an acrolein of the general formula III ##STR3## is reacted with water or with water in the presence of an acid or with an alcohol in the presence of an acid at from 150.degree. to 400.degree. C. in the liquid phase. Novel 2-formylcyclopentanones are obtained.

    摘要翻译: 其中R 1和R 2各自为有机基团或R 1或R 2可以是氢并且R 3为氢或甲酰基的通式I(I)的环戊烷酮通过其中2-甲酰基-3,4 - 二氢吡喃,其中R 1和R 2具有上述含义,a)其中R 3是甲酰基,在酸性多相催化剂存在下在50-500℃下转化,和 b)其中R3是氢,b1)在酸性非均相催化剂存在下,在气相中在100-500℃下与水或醇反应,或b2)化合物II或通式为的丙烯醛 在酸的存在下,在酸的存在下,在液相中,在150℃至400℃的条件下,将III(III)化合物与水或水在酸或醇的存在下反应。 得到新的2-甲酰基环戊烷酮。

    Preparation of methacrylic acid
    57.
    发明授权
    Preparation of methacrylic acid 失效
    甲基丙烯酸的制备

    公开(公告)号:US5087744A

    公开(公告)日:1992-02-11

    申请号:US213837

    申请日:1988-06-30

    CPC分类号: C07C51/252

    摘要: Methacrylic acid can be prepared with advantage by gas phase oxidation of methacrolein or isobutyraldehyde over Mo- and P-containing catalysts at from 250.degree. to 400.degree. C. with cooling of the hot reaction gas to below 100.degree. C., absorption of the methacrylic acid in a water-operated absorption column, at below 100.degree. C. and partial recycling into the oxidation reactor after admixture of methacrolein or isobutyraldehyde and oxygen by feeding a quantity of methacrolein or isobutyraldehyde equal to the quantity of methacrolein or isobutyraldehyde consumed in the reaction in liquid form together with a polymerization inhibitor into the reactor gas in the lower two-thirds of the absorber column and upstream of the feed point for the fresh methacrolein or isobutyraldehyde or down-stream of the absorption column splitting off the reactor off-gas a side stream which is washed in a wash column operated with water at

    摘要翻译: 甲基丙烯酸可以通过在250℃至400℃的含Mo和P的催化剂上甲基丙烯醛或异丁醛的气相氧化来制备,同时将热反应气体冷却至低于100℃,吸收甲基丙烯酸 酸在水性吸收塔中,低于100℃,并通过加入与反应中消耗的甲基丙烯醛或异丁醛的量相等的量的异丁烯醛或异丁醛,将甲基丙烯醛或异丁醛和氧气混合后,部分再循环进入氧化反应器 液体形式与聚合抑制剂一起在吸收塔的下三分之二的反应器气体中,在新鲜的甲基丙烯醛或异丁醛的进料点的上游或吸收塔的下游分离反应器废气a 侧流在洗涤塔中用水在<10℃下洗涤以除去未转化的异丁烯醛或异丁醛,其为f 作为吸收塔顶部的水溶液。

    Bridged, water-soluble copolymers, their preparation and their use
    58.
    发明授权
    Bridged, water-soluble copolymers, their preparation and their use 失效
    桥接,水溶性共聚物,其制备及其用途

    公开(公告)号:US4981913A

    公开(公告)日:1991-01-01

    申请号:US409747

    申请日:1989-09-20

    摘要: Bridged, water-soluble copolymers are obtainable by(A) copolymerization of a monomer mixture of(a) from 50 to 99 mol % of acrylamide and/or methacrylamide,(b) from 50 to 1 mol % of a monoethylenically unsaturated monomer containing actual groups and(c) from 0 to 20 mol % of monomers which differ from (a) and (b), in the presence of a polymerization initiator under conditions such that the acetal groups of the monomers (b) undergo virtually no hydrolysis,(B) hydrolysis of the acetal groups of the monomers (b), present as copolymerized units in the copolymers (A),(C) condensation of the copolymers (B) containing aldehyde groups at a pH above 5, at most to a degree such that the resulting condensates are still water-soluble and(D) stopping of the condensation reaction by adding acid until the pH reaches 3 or less,and are used as paper stock additives in papermaking for increasing the wet strength of paper.

    摘要翻译: 桥接的水溶性共聚物可通过(A)(a)50至99mol%的丙烯酰胺和/或甲基丙烯酰胺的单体混合物共聚获得,(b)50至1mol%的单烯属不饱和单体含有实际 基团和(c)0〜20摩尔%的不同于(a)和(b)的单体,在聚合引发剂存在下,使单体(b)的缩醛基基本上不经水解的条件下, B)在共聚物(A),(C)中作为共聚单元存在的单体(b)的缩醛基团的水解在pH5以上含有醛基的共聚物(B)的缩合最多至一定程度 所得缩合物仍然是水溶性的,(D)通过加入酸直到pH达到3以下停止缩合反应,并且在造纸中用作增加纸的湿强度的纸浆添加剂。

    Preparation of 2(5H)-furanones
    60.
    发明授权
    Preparation of 2(5H)-furanones 失效
    2(5H) - 呋喃酮的制备

    公开(公告)号:US4853473A

    公开(公告)日:1989-08-01

    申请号:US201050

    申请日:1988-06-01

    IPC分类号: C07D315/00

    CPC分类号: C07D315/00

    摘要: 2(5H)-furanones I ##STR1## where R.sup.1 and R.sup.2 are each hydrogen, C.sub.1 -C.sub.6 -alkyl, C.sub.5 - or C.sub.6 -cycloalkyl, C.sub.7 -C.sub.12 -aralkyl or aryl, are prepared by heating a 3-formylcarboxylate or 3-formylcarboxylic acid II ##STR2## where R.sup.3 is hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.5 - or C.sub.6 -cycloalkyl, C.sub.7 -C.sub.12 -aralkyl or aryl, to 100.degree.-450.degree. C. in the presence of an acidic catalyst.

    摘要翻译: 2(5H) - 呋喃酮I(I)其中R1和R2各自为氢,C1-C6烷基,C5-或C6-环烷基,C7-C12-芳烷基或芳基,通过加热3-甲酰基羧酸酯 或其中R 3为氢,C 1 -C 12 - 烷基,C 5 - 或C 6 - 环烷基,C 7 -C 12 - 芳烷基或芳基的3-甲酰基羧酸II(II)在100-450℃存在下, 酸性催化剂。