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5 条记录 (耗时 0.009 秒)

    Process for preparing sorbic acid
    1.
    发明授权
    Process for preparing sorbic acid 失效
    制备硫酸的方法

    公开(公告)号：US3586714A

    公开(公告)日：1971-06-22

    申请号：US3586714D

    申请日：1968-06-10

    申请人： MONTEDISON SPA

    发明人： DUBINI MARIO ,  FERRARIS MARIO ,  MERZONI SERGIO ,  CHIUSOLI GIAN PAOLO

    IPC分类号： C07C51/09 ,  C07C51/353 ,  C07C57/10

    CPC分类号： C07C51/09 ,  C07C51/353 ,  C07C57/10

    摘要： DESCRIBED IS A PROCESS FOR PREPARING 2-TRANS-4-TRANS SORBIC ACID FROM PURE METHYL 2-CIS-5,2-TRANS-5,3-TRANS-5, HEXADIENOATE OR FORM MIXTURES THEREOF. THE PROCESS IS CHARACTERIZED BY THE FOLLOWING STEPS: METHYL HEXADIENOATE IS DISSOLVED IN METHANOL, USING 0.5 TO 1 PART OF METHANOL PER 1 PART OF ESTER; SOLID SODIUM HYDROXIDE IS ADDED IN AMOUNT FROM 0.5 TO 3% BY WEIGHT IN RESPECT OF THE ESTER AND THE WHOLE IS AGITATED AT 20-40*C. FOR 60-120 MINUTES (STEP A); SODIUM HYDROXIDE IS ADDED IN STOICHIOMETRIC AMOUNT FOR THE SAPONIFICATION AND THE WHOLE IS HEATED TO 60-80*C. FOR 60-120 MINUTES UNDER STIRRING (STEP B); WATER IS ADDED IN AMOUNT FROM 0.5 TO 1.5 VOLUMES OF WATER PER VOLUME OF SOLUTION IN ORDER TO DISSOLVE THE SALTS, AND THE METHANOL IS DISTILLED (STEP C); THE SOLUTION IS ACIDIFIED TO PH OF 3.5 WITH 5-15% SULFURIC ACID (STEP D); AFTER FILTRATION AT BETWEEN 30 AND 40*C. (STEP E), THE FILTER CAKE IS WASHED WITH WATER AND WITH AQUEOUS METHANOL (STEP F) THUS OBTAINING 2-TRANS-4-TRANS SORBIC ACID, WITH A PURITY HIGHER THAN 99%.

    Aza-hydroxy-benzanthrone
    4.
    发明授权
    Aza-hydroxy-benzanthrone 失效
    氮杂 - 羟基 - 苯甲醛

    公开(公告)号：US3912739A

    公开(公告)日：1975-10-14

    申请号：US1698970

    申请日：1970-03-05

    申请人： MONTEDISON SPA

    发明人： BOFFA GIOACCHINO ,  CHIUSOLI GIAN PAOLO

    IPC分类号： C09B5/14

    CPC分类号： C09B5/14

    摘要： There is disclosed a new product of the benzanthrone class, namely, 1-aza-2-hydroxy-benzanthrone, useful in the synthesis of vat and azoic dyes. Briefly, the new product is obtained by reacting 1,4-napthoquinone with methyl-3,5-hexadienoate, under heating, and then treating the resulting solid product with excess NH3 in anhydrous alcoholic solution, and finally recovering the 1-aza-2-hydroxy benzanthrone.

    摘要翻译： 公开了一种可用于合成大桶和偶氮染料的苯并蒽酮类的新产物，即1-氮杂-2-羟基 - 苯甲醛。 简单地说，通过在加热下使1,4-萘醌与3,5-己二烯酸甲酯反应，然后用无水醇溶液中的过量NH 3处理得到的固体产物，最终回收1-氮杂-2 - 羟基苯。

    Process for preparing beta-keto-acids
    5.
    发明授权
    Process for preparing beta-keto-acids 失效
    制备β-葡萄糖酸的方法

    公开(公告)号：US3557196A

    公开(公告)日：1971-01-19

    申请号：US3557196D

    申请日：1967-07-31

    申请人： MONTEDISON SPA

    发明人： BOTTACCIO GIORGIO ,  CHIUSOLI GIAN PAOLO

    IPC分类号： C07C51/15 ,  C07C61/36

    CPC分类号： C07C51/15 ,  C07C59/84 ,  C07C59/347 ,  C07C59/195 ,  C07C59/205 ,  C07C59/353

    摘要： DISCLOSED IS A PROCESS FOR PREPARING BETA-KETO-ACIDS HAVING THE FORMULA R-CO-CHR''-COOH FROM KETONES R-CO-CH2-R'' WHEREIN R AND R'' ARE HYDROCARBYLS CONTAINING 1 TO 10 C; R'' MAY BE H; R AND R'' TAKEN TOGETHER GIVE A CYCLOALKYLENE. THE PROCESS IS CHARACTERIZED IN THAT THE KETONE IS REACTED WITH CARBON DIOXIDE, IN THE PRESENCE OF ALKALINE SALTS OF PHENOLS IN AN INERT POLAR MEDIUM. THE ALKALINE PHENOL SALTS PREFERRED ARE THE LI, NA, K SALTS OF PHENOL, HYDROQUINONE AND THEIR METHYL HOMOLOGS. THE INERT POLAR MEDIUM IS PREFERABLY SELECTED FROM TRIALKYLPHOSPHINOXIDES, TRIALKYL-PHOSPHATES, HEXALKYL-PHOSPHOTRIAMIDES, DIALKYL-SULPHOXIDES, DIALKYLFORMAMIDES, DIALKYL-ACETAMIDES, TETRALKYLUREAS, PYRIDINE, DIALKYLETHERS OF MONO-, DI- AND TRI-ETHYLENEGLYCOL, WHEREIN ALKYL IS METHYL AND/OR ETHYL.