摘要:
Latent dispersants were made by the hydrogenation of an alkyl ketene dimer, alkenyl ketene dimer, or ketene multimer. Adding the latent dispersant to paper or paperboard increased its resistance to water and water vapor while maintaining recyclability and repulpability. Additionally, provided is a method for increasing the repulpability of a wax coated paper or paperboard. Dispersants made by the hydrolysis of the alkyl ketene dimer, alkenyl ketene dimer, and ketene multimer are also described.
摘要:
The embodiments of the process of the present invention relate to the preparation of alkyl ketene dimers (AKD), where the process combines at least one polyamine with a fatty acid chloride in a molar ratio of less than one mole of polyamine to one mole of fatty acid chloride thereby forming an alkyl ketene dimer/amine salt that is subsequently separated into an organic dimer layer and an aqueous salt layer.
摘要:
The present invention relates to a method for producing a gypsum-containing foamed prefabricated building material and to a gypsum-containing foamed prefabricated building material.
摘要:
The present invention discloses the device and method for continuously preparing high-purity AKD without solvent. The adopted device includes a kind of reactor which could make continuous mixing reaction of raw materials. The main preparation process is: firstly, the tertiary amine is continuously fed into the reactor from starting end and the acyl chloride is continuously fed from three to ten line; secondly, under the operating state of reactor, the main motor drives the internal cylinder to rotate in relation to external cylinder, forcing the fed materials to be conveyed and stirred by blades in the conveying section of annular column passage and forcing the fed materials to be sheared and mixed by relative movement of shearing blades and kneading blades at mixing section. Due to alternate arrangement of conveying section and mixing section along the axial direction of annular column passage, it causes the sufficient reaction of fed materials and controls the material temperature through internal and external heat exchange systems until the reaction products are discharged continuously from outlet. The device and process adopted by the present invention could realize the disperse generation of reaction heat and sufficient material mixture and complete reaction to make it easy to control the reaction temperature and material viscosity and decrease the generation of side reaction to ensure the high purity of products.
摘要:
Verfahren zur Herstellung von lösungsmittelarmen Alkyldiketenen der allgemeinen Formel I in der
R 1 C 10 - bis C 30 -Alkyl oder C 10 - bis C 30 -Alkenyl und R 2 Wasserstoff oder C 1 - bis C 8 -Alkyl bedeuten, durch Umsetzung von Carbonsäurechloriden der allgemeinen Formel II in der R 1 und R 2 die obengenannten Bedeutungen haben, mit tertiären Aminen der allgemeinen Formel III in der
R 3 ,R 4 ,R 5 C 1 - bis C 12 -Alkyl oder C 3 - bis C 12 - Cycloalkyl, R 3 und R 4 gemeinsam eine gegebenenfalls durch Sauerstoff oder Stickstoff unterbrochene C 2 - bis C 11 -Alkylendikette, bedeuten, in einem mit Wasser im wesentlichen nicht mischbaren, inerten Lösungsmittel, indem man bei Temperaturen von 80 bis 130°C und Drücken von 10 bis 500 mbar und anschließend unter Zusatz von Wasser oder Wasserdampf destilliert.
摘要翻译:在制作 的式(I)的烷基二乙烯基, 通过使式R 1 R 2 CHC(O)Cl(II)的羧酰氯与叔 - 在与水不混溶的惰性溶剂中的式(III)的胺反应混合。 在80-130℃和10-500毫巴下蒸馏,然后加入。 的水或蒸汽。 在式中,R 1 = 10-30 C(en) R 2 = H或1-8C烷基; R 3,R 4,R 5 = 1-12C烷基或3-12个C环烷基; 或R 3 + R 4 = 2-11C亚烷基, 链中有O或N。
摘要:
Disclosed is a novel process for the manufacture of 2,2,4,4-tetramethylcyclobutanediol commencing with the pyrolysis of isobutyric anhydride to produce dimethylketene. Dimethylketene is absorbed into certain carboxylate ester solvents which function as the process solvents for subsequent dimerization of the dimethylketene to 2,2,4,4-tetramethylcyclobutanedione followed by the catalytic hydrogenation of the dione to the diol product.
摘要:
Stabilisierte wäßrige C₁₄- bis C₂₂-Alkyldiketenemulsionen, die als wesentliche Bestandteile
(a) 10 bis 60 Gew.-% mindestens eines C₁₄- bis C₂₂-Alkyldiketens, (b) 1 bis 10 Gew.-% mindestens eines Schutzkolloids und (c) 0,1 bis 20 Gew.-% mindestens eines Esters der Formel
in der R¹, R² = C₁₄- bis C₂₂-Alkyl, wobei sich R¹ und R² in diesem Fall um mindestens 4 C-Atome in der Alkylgruppe unterscheiden, und/oder gleiche oder unterschiedliche C₁₄- bis C₂₂-Alkenylgruppen bedeuten, eines Esters der Formel R³-O-CO-O-R⁴ (II), in der R³ und R⁴ Alkyl- oder Alkenylreste mit 2 bis 22 C-Atomen sind oder eines Urethans der Formel
enthalten, in der R⁵, R⁶ und R⁷ gleiche oder verschiedene Alkyl- oder Alkenylreste mit 2 bis 22 C-Atome bedeuten, und R⁵, R⁶ oder R⁷ sowie die Verwendung der Verbindungen der Formeln I bis III als Stabilisator zur Herstellung von Alkyldiketenemulsionen, die mindestens 10, vorzugsweise 16 bis 40 Gew.-% Alkyldiketen emulgiert enthalten.
摘要:
The embodiments of the process of the present invention relate to the preparation of alkyl ketene dimers (AKD), where the process combines at least one polyamine with a fatty acid chloride in a molar ratio of less than one mole of polyamine to one mole of fatty acid chloride thereby forming an alkyl ketene dimer/amine salt that is subsequently separated into an organic dimer layer and an aqueous salt layer.
摘要:
The invention relates to a method of preparing dimethylcetene (DMK) by pyrolysis of isobutyric anhydride (ANIB), consisting in: (a) pre-heating a mixture to between 300 and 340 DEG C at atmospheric pressure, said mixture comprising between 1 and 50 % volume ANIB for between 99 and 50 % inert gas respectively; (b) bringing said mixture to a temperature of between 400 and 550 DEG C for a contact time of between 0.05 and 10 s in order to obtain a mixture of DMK, inert gas, isobutyric acid (AIB) or unreacted ANIB; and (c) cooling (condensation step) the mixture produced in step (b) in order to separate the gaseous mixture comprising the DMK from the condensed ANIB and/or AIB.