摘要:
There are produced carboxylic acid cyanides, e.g., acyl cyanides by reacting a carboxylic acid halide with an alkali cyanide or hydrogen cyanide in the presence of a copper (I) salt and a carboxylic acid nitrile. Especially advantageous are glutaric acid dinitrile and 2-methyl glutaric acid dinitrile.
摘要:
There is disclosed a process for the production of 1,4-bis-[3-(3,4,5-trimethoxybenzyloxy)-propyl]-diazepane which consists of first reacting 3-aminopropanol with acrylonitrile and subsequently reacting in aqueous solution with formaldehyde and hydrocyanic acid or with formaldehyde and an alkali cyanide in the presence of alkali hydrogen sulfite to form cyanomethyl-(2-cyano-ethyl)-(3-hydroxy-propyl)-amine; hydrogenating the thus obtained reaction product in the presence of a hydrogenating catalyst and ammonia to 1 (3-hydroxy-propyl)-1,4-diazepane and reacting the latter compound for example with 3-halogen propanol or with allyl alcohol and introducing two 3,4,5-trimethoxy-benzoyl groups into the thus obtained reaction product by esterification.
摘要:
1,2-Diols of the formula: ##STR1## where R.sub.1 and R.sub.2 are hydrogen, alkyl of 1 to 10 carbon atoms or such as alkyl substituted by a halogen, a hydroxy group, a phenyl group, a methoxy group, or an ethoxy group, a phenyl group or a furyl group or R.sub.1 and R.sub.2 together form an alkylene group of 2 to 7 carbon atoms are formed by hydrogenating a correspondingly substituted cyanohydrin in an aqueous medium first in the presence of a hydrogenation catalyst and an acid at a temperature between -20.degree. and +25.degree. C. and a hydrogen pressure of less than 10 bar until per mole of cyanohydrin employed there is taken up one mole of hydrogen and then the hydrogenation continued to the end of the absorption of hydrogen in the presence of metallic nickel at a temperature between 30.degree. and 100.degree. C. and a hydrogen pressure between 10 and 150 bar.
摘要:
Aqueous solutions of sodium salts of .alpha.-aminocarboxylic acids practically free of foreign salts are produced by saponifying the corresponding hydantoin at a temperature between 110.degree. C. and 180.degree. C. with a mixture, in each case based on the hydantoin, of 1 equivalent of sodium hydroxide and 2 equivalents of calcium oxide or hydroxide, separating off the precipitated calcium carbonate after the end of the saponification and concentrating the aqueous sodium salt solution remaining to drive off the ammonia contained therein.
摘要:
.beta.-hydroxy-.alpha.-aminocarboxylic acids of the formula: ##STR1## where R.sub.1 and R.sub.2 are hydrogen or an alkyl group having 1 to 10 carbon atoms are produced by hydrogenating the correspondingly substituted cyanohydrin in a water containing medium first in the presence of a hydrogenation catalyst and an acid at a temperature between -10.degree. and +40.degree. C. and a hydrogen pressure of less than 10 bar, until per mole of cyanohydrogen employed one mole of hydrogen is taken up and then employing the solution obtained as starting material for a Strecker or Bucherer synthesis of an amino acid.
摘要:
The present invention relates to a method of using foam to remove pollutants and/or heavy metals from a flowable media. The method may include providing a foam that may include cavities wherein the cavities may include an adsorbent composition of iron oxyhydroxy granules. The iron oxyhydroxy granules may have a BET surface area of >100 m2/g and a mean particle size of 0.1 mm-2 mm. The method may further include passing a flowable media containing pollutants and/or heavy metals through the foam wherein the pollutants and heavy metals may be removed from the flowable media by the iron oxyhydroxy granules. A method of manufacturing the foam is also disclosed. The method may include introducing an adsorbent composition into a liquid reaction composite to form a mixture and adding an isocyanate reaction component to the mixture to form the foam.
摘要翻译:本发明涉及使用泡沫从可流动介质中除去污染物和/或重金属的方法。 该方法可以包括提供可以包括空腔的泡沫,其中空腔可以包括铁羟基羟基颗粒的吸附剂组合物。 铁羟基羟基颗粒可以具有> 100m 2 / g的BET表面积和0.1mm-2mm的平均粒度。 该方法可以进一步包括使含有污染物和/或重金属的可流动介质通过泡沫,其中污染物和重金属可由铁羟基羟基颗粒从可流动介质中除去。 还公开了制造泡沫的方法。 该方法可以包括将吸附剂组合物引入到液体反应复合物中以形成混合物并将异氰酸酯反应组分加入到混合物中以形成泡沫。
摘要:
A method for the continuous production of foam blocks or foam sandwich panels involving the application of the liquid foamable reaction mixture to the continuously moving shaping support in a manner which avoids large gas inclusions in the final product produced. The liquid foamable reaction mixture is preliminarily distributed by the use of a particular distributor channel means in a traverse direction to the continuously moving shaping support, permitted to flow in the form of a descending film exposed to the atmosphere to an intermediate storage means and then conveyed to said continuously moving shaping support. The distributor channel means may also be pivoted to control the outflow of the mixture.
摘要:
The instant invention relates to a process and an apparatus for applying a layer of liquid, foamable reaction mixture to a continuously moving support, such as for the production of foam blocks or foam sandwich panels having a thick foam core.