Abstract:
The invention provides a method to produce primary diamines by catalytic conversion of diols having a linear main chain of from 4 to 31 carbon atoms into the corresponding diamines. The reaction is conducted in a liquid or supercritical phase and is catalyzed by a homogeneous ruthenium-containing complex. The primary diamines obtained may be suitable for polyamide syntheses.
Abstract:
Preparation of cyclododecatriene in a continuous or discontinuous process by trimerization of butadiene in the presence of a catalyst system and a solvent, the crude cyclododecatriene obtained being able to be isolated by means of distillation. The cyclooctadiene formed as by-product can likewise be isolated from the crude product.
Abstract:
The invention relates to a plant for carrying out chemical reactions, having a reactor (1), the reaction space of which contains hydrogen peroxide (H2O2) and titanium silicalite (TS-1). The object of the invention is to improve such a plant such that continuous separation and recycling of the active catalyst to the reaction space is possible with a long filter service life. This is achieved in that the reaction space contains a solid silicon source, in that the plant comprises a water takeoff line (3) which is set up for drawing off water in addition to components which are dissolved and/or dispersed therein from the reaction space, in that the water takeoff line (3) leads to a filter (4) which separates off the components which are dissolved and/or dispersed in the water, and in that the plant has a return line (5) which is set up for recirculating to the reaction space components which are separated off by means of the filter (4).
Abstract translation:本发明涉及一种用于进行化学反应的设备,其具有反应器(1),其反应空间含有过氧化氢(H 2 O 2)和钛硅沸石(TS-1)。 本发明的目的是改进这种设备,使得活性催化剂在反应空间的连续分离和循环是可能的,并具有长的过滤器使用寿命。 这是通过反应空间包含固体硅源实现的,因为该设备包括除了从反应空间溶解和/或分散在其中的组分除去水以外的水引出线(3) 因为水引出线(3)通过一个过滤器(4),该过滤器(4)将溶解和/或分散在水中的组分分离出来,并且该设备具有一个回流管线(5) 再循环到通过过滤器(4)分离的反应空间部件。
Abstract:
The present invention provides a method for purifying laurolactam from a crude lactam mixture. In the method of the present invention, laurolactam is selectively crystallized by melt crystallization with controlled cooling of the crude lactam mixture.
Abstract:
The invention relates to a method for the coammoxidation, i.e. for the simultaneous ammoxidation of ketones, especially of cyclic ketones such as cyclododecanone and cyclohexanone. The ammoxidatian method of the invention relates to the production of oximes from ketones or aldehydes using hydrogen peroxide and amnmonia and further using a catalyst that substantially consists of silicon, titanium and oxygen, such as for example titanium silicalite.
Abstract:
An oxime is synthesized by ammoximation of a carbonyl compound. In stage (i) of the process, a carbonyl compound containing 6 to 20 C atoms is reacted with ammonia and hydrogen peroxide in the presence of a) an organic solvent that is a1) at least partly water-soluble, a2) stable under ammoximation conditions, a3) has a boiling point of higher than 100° C. and/or is capable of forming a two-phase azeotrope with water, and b) a titanium-containing heterogeneous catalyst. After the reaction, the catalyst is separated from the reaction mixture. The oxime is crystallized and separated from the reaction mixture. Water is removed from the remaining mother liquor, provided the mother liquor is a two-phase system in which one of the phases is an aqueous phase. Water or a water-containing two-phase azeotrope is distilled off from the mother liquor, while the distillation bottoms and, optionally, the predominantly organic phase of the azeotrope are recycled to stage (i).
Abstract:
A power-assisted closing device (1) for doors, flaps, folding tops or roofs of vehicles, in particular passengers cars, having a pivotably mounted rotary latch (2) which interacts with a fastening peg, a detent pawl (7) which releasably locks the rotary latch (2), and an actuating drive which acts via a disk cam (13) on the rotary latch (2) and the detent pawl (7) to effect an unlocking or locking procedure, wherein a pivotable stop element (17) is arranged on the rotary latch (2) and a pivotable stop element (20) is arranged on the detent pawl (7), the stop element (17, 20) interacting with the disk cam (13) in the unlocking or locking procedure.