Sojaproteinpräparate als Antispritzmittel für Margarine

Soy Protein Preparations as Antispattering Agents for Margarine It was found that soy protein concentrates obtained by successive extraction of ground soybeans with hexane and ethanol or with hexane alone, grinding to a particle size less than 100 μ and subsequent leaching with diluted acids at pH 4.5, are good antispattering agents. If the process is preceded by a debittering treatment of the beans with steam, products having very neutral taste are obtained. Addition of 0.2% of these concentrates to fully deaerated margarine containing 5% milk and 0.15% each of mono- plus diglycerides and lecithin, prevents spattering completely. Half-fat margarine does not spatter inspite of its high water content, if 0.1% of the concentrate is added. A disadvantage is the infection of soy protein concentrates with resistent fungus, which necessitates sterilization of the proteins at 85% C in acidic medium.     

Kompensationsspannung als zusätzliches Beurteilungskriterium für PAN-Precursorfasern

Fibres made from poly(acrylonitrile-co-methylacrylate-co-itaconic acid) were stretched under different conditions. The overall degree of orientation as well as the degree of orientation and amount of the paracrystalline regions were evaluated; mechanical properties were investigated. The correlation between the values obtained and the so-called compensation tension of the fibres leads to the conclusion that the latter is a measure for the inner tension of the fibres and renders possible improvements in preparation and processing of the fibres.     

Schrumpffähige Polyäthylenhauben — eine Transportsicherung für palettierte Güter

Shrinkable Polyethylene Covers — a Protective Device for the Transport of Palletized Goods A shrinkable polyethylene cover for palletized goods is described, which is sufficiently long in order to tie up the pallet during the process of shrinking. Thus a tightly covered bundle is obtained which represents a compact and safely transportable unit.     

Neue reaktive Mikrogele als Träger für Enzyme

By copolymerization of ethylene-dimethacrylate with acrylonitrile and glycidylmethacrylate, respectively, reactive microgels with diameters of approx. 50nm were obtained. Modification reactions led to functional groups (imidate or aldehyde groups) suitable for covalent enzyme coupling. When immobilizing the enzymes lactate dehydrogenase, alkaline phosphatase and proteinase K it was found that the residual activity of these conjugates was very much higher compared with conventional porous supports due to the absence of diffusional restrictance.     

Acetessigaldehyd-dimethylacetal als Ausgangsstoff für Synthesen

Acetoacetaldehyde Dimethylacetal as a Starting Material for Syntheses The use of acetoacetaldehyde dimethylacetal (1) leads to the introduction of the group \documentclass{article}\pagestyle{empty}\begin{document}$ {\rm =}\mathop {\rm C}\limits^{\mathop |\limits^{{\rm CH}_{\rm 2}}} ---{\rm CH}_{\rm 2} ---{\rm CH(OCH}_{\rm 3} {\rm)}_{\rm 2} $\end{document} by reaction at the carbonyl carbon atom, and of the group CH₃–CO–CH₂–CH?or CH₃–CO–CH?CH– by reaction at the acetalic carbon atom. For synthetic purposes it is important that methanol can be splitten off from 1, and the acetoacetaldehyde enol ether methoxybutenone (2) is generated. With catalytic amounts of acids or bases an equilibrium mixture with 70% 1 and 30% 2 is formed; 2 shows the higher reactivity of a vinylogous acetic ester. 1 as well as 2 can be attacked at each of the four carbon atoms; ring closure reactions were observed with the carbon atom 2 or 4 alone, or with two carbon atoms (6 possibilities, prevalent 2 + 4), and occasionally by participation of two molecules of 1 or 2.     

Verfahrenstechnische Auslegungsunterlagen für Rührbehälter als Fermenter

Engineering design data for agitator vessels as fermentors . The article develops and collects design data for stirring vessels for calculation of mass and heat transfer and the flooding point and stirrer power requirements for aerated liquids. The data refer to low-viscosity, higher viscosity, and structure viscosity liquids with difering coalescence behaviour. The working data presented are used to derive results for a specific system (air/aqueous solution of carboxymethylcellulose) which illustrate decisive relationships and limitations arising from mass and heat transfer. There results important information for the operation, and choice, and scale-up of stirred fermentors.     

Phenylquecksilberverbindungen als Konservierungsmittel für Kosmetika

Phenyl-Mercuric Compounds as Preservatives for Cosmetics 0.005 to 0.01% phenyl-mercuric salts are adequate for the preservation of cosmetics. According to the literature this preservative action is almost completely neutralized by compounds containing SH-groups, whereas the experiments carried out by the author showed that 2% solutions of degraded horn keratin at pH 8 can be preserved with 0.01 to 0.005% phenyl mercuriacetate. Addition of 0.3% sodium lauryl sulphate improved the action. Sensitivity tests carried out on 12 persons who were hypersensitive to mercury showed positive reactions only in two cases.     

Silikon als Rohstoff für Schäumer und Entschäumer

Silicone as Raw Material for Foaming and Anti-Foaming Agents The remarkable significance of methyl polysiloxanes in the field of anti-foaming agents is based on two fundamental principles, namely, low intermolecular interactions (low surface tension), and the unique variability of the polymer system which permits that by variation of molecular weight, molecular weight distribution as well as the nature and number of end groups, these agents can be made to fit into a particular type of application. The above properties have also led to the use of modified methyl siloxanes as foam stabilizers. In the latter case, a further factor enhancing the efficacy by the introduction of a solubilizing group in the modified siloxane is made use of. Examples for the same are polyether modified methyl polysiloxanes as foam stabilizers in polyurethane foams, and anionactive methyl siloxanes containing sulfate groups as foaming agents in fire extinguishing systems.     

Synthese kurzkettiger Alkansulfonsäuren als Additive für industrielle Reiniger

Synthesis of Short-Chained Alkanesulfonic Acids as Additives in Industrial Cleaners Short-chained alkanesulfonic acids are useful additives in industrial cleaners because they are able to remove both organic as well as mineral residues. Because of their high acidity and the low foam formation they are discussed as substitutes of phosphoric acid in acidic cleaners. A production process of ethane-, propane- and butane sulfonic acid was developed on the base of the olefins ethene, propene and 1-butene. In a first step the olefin reacts with ammonium bisulfite in a radical reaction to yield the ammonium sulfonate. In the second step the alkanesulfonic acids are formed by acidification of the sulfonates with concentrated hydrochloric acid.     

Elektrisch leitfähige polymerfilme, 1. 1,2-di-(N-n-alkyl-pyridinium-4)-ethylen-TCNQ-komplexe für elektrisch leitfähige polymerfilme: Darstellung und eigenschaften

In preparing polymer films doped with electrically conducting 7,7,8,8-tetracyanoquinodimethane-(TCNQ)-complexes, one of the requirements is an adequate solubility of these complexes. The solubility of the 1,2-di-(N-methyl-pyridinium-4)-ethylene-TCNQ-complex could be improved by a systematic extension of N-alkyl-chains though partly at the expense of stability and electrical conductivity. In addition to its sufficient conductivity and solubility, the 1,2-di-(N-n-propyl-pyridinium-4)-ethylene-TCNQ-complex was surprisingly found to display an unexpected thermal stability. Preparation and important properties (solubility in N-methyl pyrrolidone (NMP), electrical conductivity, thermal stability) of the complexes with alkyl- = ? CH₃, ? C₂H₅, -n-C₆H₁₃, -n-C₈H₁₇ (TCNQ-content: 4 moles) and with alkyl- = -n-C₃H₇, -n- C₄H₉, -n-C₅H₁₁ (TCNQ-content: 5 moles) are reported.     

Stationäre Chemische Energieumwandlung als Herausforderungen für den Verfahrensingenieur

Meeting future energy demands with more efficient, lower emission, and safe energy technologies has top priority in the medium term. Consumer-friendly energy concepts, integrated into regional and supraregional energy supply structures, represent further elements. These will make important contributions to resource-conserving and environmentally compatible power supplies utilizing local energy sources including renewable resources. Supplying energy to large areas involves additional tasks, from compensation of large amounts of fluctuating energy to the transport of fluctuating energy to the transport of renewable energy over long distances. Solar dish, parabolic section, and tower power generating plant have considerable economic and CO₂-reduction potential in sunny countries, such as in the Mediterranean region, However, the costs of solar-thermal electricity generation have to be reduced by a factor of 1.5 to 2. Fuel cell systems can attain particular significance as efficient low-emission energy conversion systems in power plant and automative engineering once their technical and economic potential can be realized.     

Bistetraphenylethylenorthosilikat als Initiator für radikalische Polymerisationen

Bistetraphenylethylenorthosilikat (I) wurde auf seine Initiatoreigenschaften bei der Polymerisation von Methylmethacrylat und Styrol untersucht. Aus der Abhängigkeit der Bruttogeschwindigkeit der Polymerisation von Initiator- und Monomerkonzentration muß auf einen beträchtlichen Primärradikalabbruch geschlossen werden. Die holen Molekulargewichte der erhaltenen Polymeren, die relativ hohe Grenzviskosität und die Erniedrigung der Molekulargewichte nach der Hydrolyse der Si? O? C-Bindung in den Polymeren lassen schließen, daß (I) durch Spaltung beider C? C-Bindungen Polymerketten starten und abbrechen kann, so daß kurzkettenverzweigte, relativ starre Makromoleküle entstehen. Die Brauchbarkeit von (I) als Hochtemperaturhärter von ungesättigten Polyester-Harzen wurde durch Vergleich mit Benzpinakol gezeigt.     

Thermogravimetrie als brennbarkeitsbestimmungs-methode für lineare polyurethane

In the present work oxygen index (OI) measurements and thermogravimetric analysis (TG) for a series of polyurethanes based on diols and isocyanate were conducted. It was found that a correlation exists between some of the thermal degradation parameters obtained from TG and OI-values. Analysis of experimental results confirms that the amount of mass loss at 250°C is directly proportional to the OI-value. It was also found that the logarithmic temperatures of maximal decomposition rates are directly proportional to the OI-values.     

Telechele als bausteine für neuartige polymere

The developments in the syntheses of α,ω-bifunctional oligomers (telechelics) are revued. Telechelic soft segments are synthesized by cationic, anionic and radical polymerization of vinyl and heterocyclic monomers. Telechelic PTHF obtained with CH₃CO⁺/Ac₂O stems from an equilibrating process and not from a transfer reaction. Telechelic polyisobutene is formed by the inifer technique of Kennedy. The use of lithium initiators with protected functional groups in butadien polymerization results in products with high 1.4-content. The group transfer polymerisation is specially suited to prepare telechelic PMMA of narrow molecular weight distribution. The “dead end” polymerisation is a necessary condition to obtain a functionality of two by radical polymerization. The synthesis of telechelic hard segments of the PPO and PPS type is described.