摘要:
A process for polymerization of a diene is provided. The process comprises: a) reacting the diene with hydrogen peroxide in a hydrophilic organic solvent in the presence of water to obtain a polymerization reaction mixture; b) contacting the polymerization reaction mixture with water having a temperature of from 20 to 80° C. to form a mixture having an organic phase and an aqueous phase; c) removing unreacted gaseous diene from the water mixture obtained in b); d) separating the aqueous phase comprising the hydrophilic solvent from the organic phase of the water mixture; and e) distilling volatile materials from the separated organic phase from d) to obtain the polymerization product; wherein a temperature of the reaction a) is from 50-150° C., a pressure of the reaction a) is from 0 to 50 bar, the unreacted gaseous diene removed in c) is condensed, distilled and the distillate obtained reacted according to a), and the hydrophilic solvent is recovered from the separated aqueous phase and reused according to a). Also provided is an apparatus for conducting the process of the invention.
摘要:
Process for the preparation of 1-hydroperoxy-16-oxabicyclo[10.4.0]hexadecane (DDP-OOH), wherein 13-oxabicyclo[10.4.0]hexadec-1(12)-ene (DDP) and hydrogen peroxide are reacted in a diluent in the presence of a strong acid, the diluent has a pKa value of greater than or equal to 4.5 and the strong acid has a pKa value of less than or equal to 1.5, wherein after the reaction has taken place, the strong acid is neutralized with at least 0.9 molar equivalent of a base.
摘要:
The present invention relates to a process for the synthesis of cinnamic esters and/or cinnamic acids by condensation of aldehydes with carboxylic anhydrides, using iron(II) salts as catalyst.
摘要:
The disclosed popcorn popper has a housing and a container for heating popcorn popping ingredients introduced into the container for popcorn making. The container can be pivoted with respect to the housing for emptying. The popcorn popper also has an induction heater with an induction coil disposed beneath the container for generating a alternating high-frequency magnetic field. The induction coil is pivotable together with the container.
摘要:
Process for the preparation of 1-hydroperoxy-16-oxabicyclo[10.4.0]hexadecane (DDP-OOH), wherein 13-oxabicyclo[10.4.0]hexadec-1(12)-ene (DDP) and hydrogen peroxide are reacted in a diluent in the presence of a strong acid, the diluent has a pKa value of greater than or equal to 4.5 and the strong acid has a pKa value of less than or equal to 1.5, wherein after the reaction has taken place, the strong acid is neutralized with at least 0.9 molar equivalent of a base.
摘要:
An electrode connection includes coated contact surfaces in differently constructed electrode strings formed of carbon and graphite being provided with sliding layers. With the aid of these sliding layers, the elements of a string can be screwed more firmly against one another, with the result that a higher release torque and higher operating reliability are achieved.
摘要:
The invention relates to an improved process for preparing 3-aminomethyl-3,5,5-trimethylcyclohexylamine, referred to hereinafter as isophoronediamine or, in abbreviated form, IPDA, by: I. preparation of isophorone by catalyzed aldol condensations with acetone as reactant; II. reaction of isophorone with HCN to form isophoronenitrile (IPN, 3-cyano-3,5,5-trimethylcyclohexanone); III. catalytic hydrogenation and/or catalytic reductive amination (also referred to as aminative hydrogenation) of 3-cyano-3,5,5-trimethylcyclohexanone, hereinafter called isophoronenitrile or, in abbreviated form, IPN, to give the isophoronediamine.
摘要:
The invention relates to an improved process for preparing 3-aminomethyl-3,5,5-trimethylcyclohexylamine, referred to hereinafter as isophoronediamine or, in abbreviated form, IPDA, by: I. preparation of isophorone by catalyzed aldol condensations with acetone as reactant; II. reaction of isophorone with HCN to form isophoronenitrile (IPN, 3-cyano-3,5,5-trimethylcyclohexanone); III. catalytic hydrogenation and/or catalytic reductive amination (also referred to as aminative hydrogenation) of 3-cyano-3,5,5-trimethylcyclohexanone, hereinafter called isophoronenitrile or, in abbreviated form, IPN, to give the isophoronediamine.
摘要:
A method of producing a calibrating body, gage or measuring device, preferably a screw-thread measuring device, at least partially including a C—SiC material constructed of a porous, carbon-containing material with infiltrated liquid Si, includes converting the Si at least partially to SiC by reaction with carbon. The C—SiC material is produced from a C—C material based on carbon felt material produced by pressing monofibers or fiber fragments irregularly entwined with each other. A calibrating body, gage or measuring device, preferably a screw-thread measuring device, is also provided.
摘要:
A method of producing a calibrating body, gage or measuring device, preferably a screw-thread measuring device, at least partially including a C-SiC material constructed of a porous, carbon-containing material with infiltrated liquid Si, includes converting the Si at least partially to SiC by reaction with carbon. The C-SiC material is produced from a C-C material based on carbon felt material produced by pressing monofibers or fiber fragments irregularly entwined with each other. A calibrating body, gage or measuring device, preferably a screw-thread measuring device, is also provided.