摘要:
The invention relates to a method for producing low-emission polyurethane foams which are stable during hydrolysis, using special catalysts. The invention also relates to polyurethane foams produced by said method and catalyst compositions that are to be used therein.
摘要:
The invention relates to microemulsions containing alkanolammonium salts of alkyl sulfates and/or alkylpolyalkylene glycol ether sulfates, in addition to anti-UV agents and/or anti-dandruff agents. The invention also relates to the use of said substances in the cosmetic and/or medical/dermatological field.
摘要:
Improved methods and related apparatus are disclosed for efficiently recovering the heat of condensation from overhead vapor produced during separation of various components of dehydrogenation reaction effluent, particularly in ethylbenzene-to-styrene operations, by the use of at least a compressor to facilitate azeotropic vaporization of an ethylbenzene and water mixture within a preferred range of pressure/temperature conditions so as to minimize undesired polymerization reactions.
摘要:
Improved integrated processes for the production of alkyl aromatic compounds are disclosed wherein aromatic compounds which may be treated for removal of deleterious substances are reacted with olefin compounds, which may also be treated for contaminant removal, in the presence of acidic zeolite catalyst(s) to produce the desired alkyl aromatic compound(s). The aromatic and preferably also the olefin feeds are treated substantially to remove contaminants, particularly the nitrogen compounds contained therein, before they are brought together for reaction in the presence of the zeolite catalyst(s). In accordance with the present invention, it has been found that feed pretreatment for removal of nitrogen compounds significantly improves the run length and life of the acidic zeolite catalyst(s). The feed pretreatment of this invention may include the steps of distillation, extraction, and/or adsorption by solid adsorbent, which may be regenerated in accordance with further embodiments of this invention.
摘要:
An object producing an acoustic wave is located and identified by passive detection of the acoustic wave. The acoustic wave is detected by different sensors (104) in an array (102) having a plurality of passive acoustic detectors (104). The sensors (104) produce signals in response to detection of the acoustic wave. A wavelet derived from an acoustic wave of a known form with which each of the at least three signals correlates is determined. Time difference of arrival (TDOA) measurements between the at least three signals using correlation intensity with the wavelet is used to perform acoustic reciprocity from each of the different detectors. The result of the acoustic reciprocity is a hemisphere centered around each of the different sensors (104). The hemispheres produced by the acoustic reciprocity are examined to determine an intersection point of at least three hemispheres. The size of the hemispheres is increased according to the velocity of the acoustic wave and pre-determined intervals until an intersection point is found. The intersection point represents the location of the object.
摘要:
The invention relates to resource operating medium compositions containing additivated lubricants based on polyalkylene glycols and/or neopentyl polyol esters, which are additivated with alkylated triaryl phosphate esters which are suitable for lubricating refrigerators, air-conditioning systems, heat pumps and similar systems which are operated using carbon dioxide as an operating medium.
摘要:
A guardrail structure having a plurality of vertical support posts (32) supporting a plurality of guardrail beams (42). Each post includes a pair of flanges (141, 142) having free edge portions with edge folds defining tubular beads (144, 146) on the free edge portions to provide reinforcement that result in a minimum amount of material usage for the posts. Spacers or blockouts (35D) may be mounted between the guardrail beams and the posts to offset the posts from the guardrail beams.
摘要:
A process for converting natural gas to a liquid hydrocarbon wherein the natural gas feed stream is admixed with a hot gas stream, the hot gas stream being at a temperature sufficient to effect a chemical reaction forming an intermediate product stream containing reactive hydrocarbons, the intermediate product stream being quenched and subsequently reacted in a liquefaction zone to produce hydrocarbon liquids, hydrocarbon gases from the liquefaction zone being recycled to the natural gas feed stream, hydrocarbon liquid product being recovered from the liquefaction zone.
摘要:
The invention relates to amphiphilic, non-ionic oligoesters that are free-flowing at an ambient temperature. Said oligoesters are produced by reacting dicarboxylic acid compounds, polyol compounds of water-soluble alkylene oxide addition products and optionally diol compounds. The invention also relates to detergent formulations and concentrates containing the aforementioned oligoesters and the use of oligoesters as additives in detergents, in particular for cleaning hard surfaces.