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24505 results about "Urea" patented technology

This medication has 2 types of ingredients (emollient, keratolytic) that work together to treat or prevent dry, rough, scaly, itchy skin (e.g., eczema, keratosis, xerosis). Dry skin is caused by a loss of water in the upper layer of the skin. Emollients are substances that soften and moisturize the skin and decrease itching and flaking.

Topologically segregated, encoded solid phase libraries comprising linkers having an enzymatically susceptible bond

The invention relates to libraries of synthetic test compound attached to separate phase synthesis supports. In particular, the invention relates to libraries of synthetic test compound attached to separate phase synthesis supports that also contain coding molecules that encode the structure of the synthetic test compound. The molecules may be polymers or multiple nonpolymeric molecules. Each of the solid phase synthesis support beads contains a single type of synthetic test compound. The synthetic test compound can have backbone structures with linkages such as amide, urea, carbamate (i.e., urethane), ester, amino, sulfide, disulfide, or carbon-carbon, such as alkane and alkene, or any combination thereof. Examples of subunits suited for the different linkage chemistries are provided. The synthetic test compound can also be molecular scaffolds, such as derivatives of monocyclic of bicyclic carbohydrates, steroids, sugars, heterocyclic structures, polyaromatic structures, or other structures capable of acting as a scaffolding. Examples of suitable molecular scaffolds are provided. The invention also relates to methods of synthesizing such libraries and the use of such libraries to identify and characterize molecules of interest from among the library of synthetic test compound.
Owner:AVENTIS PHARMA INC

Exhaust aftertreatment system using urea water

An exhaust aftertreatment system comprises an injector for injecting urea water into an exhaust duct, and a denitration catalyst disposed downstream of the injector with respect to a flow of exhaust gas. The exhaust aftertreatment system reduces nitrogen oxides in the exhaust gas by the denitration catalyst while using ammonia produced from the urea water injected from the injector. The urea water is injected along a direction of the flow of the exhaust gas within the exhaust duct, and a porous plate is disposed in multiple stages in a space of the exhaust duct such that droplets of the injected urea water impinge against the porous plate before reaching a wall surface of the exhaust duct. A surface of the porous plate subjected to the impingement of the droplets is arranged to face downstream with respect to the flow of the exhaust gas. Deposition of the urea water is prevented by causing film boiling when the droplets impinge against the porous plate, and the urea water reflected by the porous plate is uniformly dispersed into the exhaust gas. Thus, the urea water is uniformly dispersed into the exhaust gas without increasing a pressure loss of the exhaust gas. The urea water is prevented from depositing on the wall surface and producing a precipitate in the form of a solid.
Owner:HITACHI HIGH-TECH CORP +2

Control unit and control method for reductant supply device

There are provided a reductant supply device and a control method for the reductant supply device, which can prevent heat damage of a reductant injection valve, and also prevent crystallization of urea solution due to excessive cooling of the solution reductant.The reductant supply device which is used in an exhaust gas purification device that injects and supplies, as a reductant, a urea solution to an exhaust gas upstream side of a reduction catalyst disposed in an exhaust gas passage of an internal combustion engine, and that reduces and purifies nitrogen oxides contained in exhaust gas using the reduction catalyst, the reductant supply device having a reductant injection valve that is fixed to an exhaust pipe on the exhaust gas upstream side of the reduction catalyst, includes: a cooling water circulation passage that circulates at least part of cooling water of the internal combustion engine to cool the reductant injection valve; flow rate control means for adjusting a flow rate of cooling water flowing through the cooling water circulation passage; temperature detection means for detecting a temperature of the reductant injection valve; and control means for controlling the flow rate control means based on the temperature of the reductant injection valve.
Owner:BOSCH CORP

Method for preparing salvianolic acid A by catalytically converting salvianolic acid B

The invention discloses a method for preparing salvianolic acid A by catalytically converting salvianolic acid B. The method is characterized in that the converted raw material is a salvia miltiorrhiza aqueous extract (salvianolic acid B=>50%) primarily purified through combined chromatography; the concentration of the raw material salvianolic acid B is 0.5-2%; urea is taken as the catalyst; the mole ratio of urea to the salvianolic acid B is 0.3-0.7; the conversion reaction temperature is 100-125 DEG C; and the reaction time is 3-6 hours. The method has the following beneficial effects: urea is taken as the catalyst, thus greatly shortening the time for which the salvianolic acid B is in easily destroyed state and remarkably increasing the yield of the salvianolic acid A; the primarily purified salvia miltiorrhiza extract is taken as the converted raw material, thus not only removing the metal ions which are not beneficial to conversion but also removing most colloid-like impurities and frontal impurities which are not beneficial to following separation of the salvianolic acid; and the directional conversion rate of the salvianolic acid B to the salvianolic acid A prepared by the method is not less than 10% and even reaches 60%.
Owner:SUZHOU LEINA PHARMA RES DEV +1
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