Process for preparation of isoprene
    1.
    发明授权
    Process for preparation of isoprene 失效
    异戊二烯的制备方法

    公开(公告)号:US3972955A

    公开(公告)日:1976-08-03

    申请号:US505894

    申请日:1974-09-13

    CPC分类号: C07C11/18 C07D319/06

    摘要: In the preparation of isoprene by reacting isobutene with formaldehyde to produce 4,4-dimethyl-m-dioxane in a first stage, and decomposing the dioxane to isoprene and formaldehyde in a second stage, formaldehyde in the effluent streams of either or both of said stages is recovered. The formaldehyde-containing liquids are distilled to separate high boilers; the overhead, which is formaldehyde-rich, is extracted with isobutene feed to the process, whereby the isobutene extracts low boilers from the formaldehyde-containing liquid; and the formaldehyde-containing liquid, having at some point after said distillation been treated with an alkaline material, is subjected to rectification to produce as head product, the recovered formaldehyde.

    摘要翻译: 在通过使异丁烯与甲醛反应以在第一阶段中制备4,4-二甲基 - 间二恶烷制备异戊二烯并在第二阶段中将二恶烷分解成异戊二烯和甲醛的过程中,所述 阶段恢复。 将含甲醛的液体蒸馏以分离高锅炉; 富含甲醛的塔顶馏出物用异丁烯进料提取到该方法中,由此异丁烯从含甲醛的液体中提取低沸点物; 并且在所述蒸馏之后的某一点处,用碱性物质处理的含甲醛的液体经过精馏,作为回收的甲醛的头部产物。

    Production of .omega.-formyl carboxylic acid esters
    4.
    发明授权
    Production of .omega.-formyl carboxylic acid esters 失效
    生产“7-甲酰基羧酸酯”

    公开(公告)号:US4013709A

    公开(公告)日:1977-03-22

    申请号:US651989

    申请日:1976-01-23

    IPC分类号: C07C69/67 C07C67/00

    CPC分类号: C07C69/67

    摘要: A process for the production of an .omega.-formyl carboxylic acid ester, comprising reacting an enol ether of a cyclic ketone with hydrogen peroxide in the presence of at least one catalyst selected from the group consisting of a compound of boron or of a metal of the Fifth or Sixth Secondary Group of the Periodic Table. Advantageously the enol ether has the formula ##STR1## wherein R.sub.1 is alkyl of 1 to about 3 carbon atoms, cycloalkyl of 5 or 6 carbon atoms or phenyl optionally substituted by fluorine, chlorine, alkoxy of 1 to about 3 carbon atoms, cyano or phenyl,n is an integer of about 3 to 10, andR.sub.2 each independently is hydrogen, fluorine, chlorine, cyano, alkoxy of 1 to about 4 carbon atoms, alkyl of 1 to about 6 carbon atoms, cycloalkyl of 5 to 7 carbon atoms or phenyl optionally substituted by fluorine, chlorine, cyano, alkoxy of 1 to about 4 carbon atoms or alkyl of 1 to about 6 carbon atoms,And the catalyst comprises about 15 to 25 mole % based on the hydrogen peroxide of a boron oxide, a boric acid, a salt of a boric acid, a boron halogen compound, a complex boron compound or a boric acid ester of the formula ##STR2## wherein R.sub.4, R.sub.5 and R.sub.6 each independently is alkyl of 1 to about 6 carbon atoms optionally substituted by hydroxyl, fluorine, chlorine, alkoxy of 1 to about 3 carbon atoms or phenyl, cycloalkyl of 5 to 7 carbon atoms or phenyl optionally substituted by fluorine, chlorine or alkyl of 1 to about 3 carbon atoms,Or about 0.01 to 1 mole % of at least one acetate, benzoate, acetylacetonate or naphthenate of a metal of the Fifth or Sixth Group of the Periodic table.

    Process for the preparation of polyhydric phenols
    6.
    发明授权
    Process for the preparation of polyhydric phenols 失效
    多元酚的制备方法

    公开(公告)号:US4182917A

    公开(公告)日:1980-01-08

    申请号:US857622

    申请日:1977-12-05

    CPC分类号: C07C37/60

    摘要: A process has been invented for the preparation of pyrocatechol and hydroquinone which comprises reacting a solution which is substantially anhydrous and free from hydrogen peroxide, of a percarboxylic acid in an inert, organic solvent, with phenol at temperatures from -10.degree. C. to 80.degree. C.The compounds obtained according to the invention are known, important industrial chemicals which are used in large amounts in the field of photography and of dyestuffs and plastics and in the field of scents and flavorings.

    摘要翻译: 已经发明了一种用于制备邻苯二酚和氢醌的方法,其包括将基本上无水和不含过氧化氢的过氧化物在惰性有机溶剂中与苯酚在-10℃至80℃的温度下反应 DEG。根据本发明获得的化合物是已知的,在摄影领域和染料和塑料领域以及在香料和调味品领域中大量使用的重要的工业化学品。

    Process for the preparation of hexahydrophthalic acid anhydride
    9.
    发明授权
    Process for the preparation of hexahydrophthalic acid anhydride 失效
    六氢邻苯二甲酸酐的制备方法

    公开(公告)号:US4244877A

    公开(公告)日:1981-01-13

    申请号:US41547

    申请日:1979-05-23

    IPC分类号: C07C51/377 C07D307/89

    CPC分类号: C07C51/377

    摘要: A process for the preparation of hexahydrophthalic acid anhydride which comprises hydrogenation .DELTA..sup.4 -tetrahydrophthalic acid anhydride in the liquid phase at a temperature of from 70.degree. to 150.degree. C. and at a pressure of from 30 to 200 bar in the presence of a catalyst selected from palladium, ruthenium, nickel or mixtures thereof arranged in a fixed bed, wherein the catalyst is applied to a carrier of alumina of which at least 20% by weight has been converted into lithium aluminium spinel and the liquid phase is a mixture of .DELTA..sup.4 -tetrahydrophthalic acid anhydride and hexahydrophthalic anhydride in a proportion by weight of from 1:1 to 1:100.

    摘要翻译: 一种制备六氢邻苯二甲酸酐的方法,其包括在液相中在催化剂存在下,在70〜150℃,压力为30〜200巴的条件下氢化DELTA4-四氢邻苯二甲酸酐 选自钯,钌,镍或其混合物,其中催化剂被施加到其中至少20重量%已经转化为锂铝尖晶石的氧化铝载体,液相是DELTA的混合物 4-四氢邻苯二甲酸酐和六氢邻苯二甲酸酐,其重量比为1:1至1:100。