Polish Journal of Chemical Technology

Items from 1 to 20 out of 1,423 results

article

Solubility investigations in the NaVO3 + NH4HCO3 + NH4VO3 + NaHCO3 + H2O system

M. Trypuć, U. Kiełkowska

Polish Journal of Chemical Technology > 1999 > Vol. 1, nr 1 > 40-44

Mutual salts solubility in the NaVO3 + NH4HCO3 + NH4VO3 + NaHCO3 + H2O system at temperature 303 K and the carbonization degree (R) of 90% has been studied. On the basis of the compiled data, a solubility polytherm section in the oblique projection on plane according to Janecke has been plotted. It has been found out that ammonium metavanadate is a sparingly soluble salt, NH4VO3 and NaHCO3 compose...

article

Promoted nickel steam reforming catalysts: influence of thermal treatment on the activity and resistance to coking

T. Borowiecki, A. Gołębiowski, K. Stołecki, B. Stasińska

Polish Journal of Chemical Technology > 1999 > Vol. 1, nr 1 > 2-6

An introduction of small amounts of promoters (Mo, W, Ba, K) into the nickel catalysts of the steam reforming of hydrocarbons reduces the detrimental effect of carbon deposit formation. Pressurized thermal treatment of the catalysts in a H2O:H2 mixture indicates that the promoting effect of the examined additions exhibits considerable stability. Ni-Mo or Ni-W catalysts can be used in the industrial...

article

Metal on oxide mondayer - new concept of selective catalyst for a, ß-unsaturated aldehydes hydrogenation

J. Kijeński, P. Winiarek, T. Paryjczak

Polish Journal of Chemical Technology > 1999 > Vol. 1, nr 1 > 16-18

A new concept of the preparation of selective catalysts for a, ß-unsaturated aldehydes reduction is presented in this work. A monolayer TiO2 on oxide carriers has been used as a support for platinum hydrogenation catalyst. The enhancement of selectivity towards unsaturated alcohols has been observed in comparison with standard Pt/TiO2 and Pt/SiO2 catalysts.

article

Technology of asbestos-free sealing materials (Gaskets)

L. Ślusarski, W. Baryń, M. Zaborski, J. Libudzisz

Polish Journal of Chemical Technology > 1999 > Vol. 1, nr 1 > 31-35

Technology of nonasbestos sealing materials has been elaborated. Materials of composite structure owi chosing of appropriate vomponents have properties comparable to the asbestos containing sealings appli earlier. Technology of general porpose sealing plates but also stable in acidic medium and strengthenod w metal net has been developed. This is orginal technology of sealing materials. Cancerogenic...

article

The Solid state postpolycondensation of poly(bisphenol a carbonate) in the presence of thermally unstable poly(propylene carbonate)

W. Kuran, C. Dębek, W. Wielgosz, L. Kuczyńska, more

Polish Journal of Chemical Technology > 1999 > Vol. 1, nr 1 > 26-30

The process for the synthesis of high-molecular-weight poly(bisphenol A carbonate) (PBC) by the solid-state postpolycondensation (SSP) process using 5-20 wt % of thermally unstable poly(propylene carbonate) (PPC) was investigated and compared with the analogous process without addition of the thermally unstable polymer. An application of poly(propylene carbonate) for the SSP process was found to enable...

article

Alkylation of hydroxyarenes with alcohols in the presence of iron catalyst

J. Wrzyszcz, H. Grabowska

Polish Journal of Chemical Technology > 1999 > Vol. 1, nr 1 > 50-52

The efficient catalytic method of alkylation of some hydroxyarenes with alcohols by a gas phase continuous process in the presence of iron catalyst modified with silicon, chromium and potassium oxides is presented. The catalyst displays high activity and stability. The alkyl group enters the ortho position of the hydroxyl group. The high yields obtained and selectivities of alkyl derivatives of hydroxyarenes...

article

Verifying the assumption of a steady-state intermediate concentration

J. Głowiński, W. Tylus

Polish Journal of Chemical Technology > 1999 > Vol. 1, nr 1 > 7-10

The behaviour of the chemical affinity at the stage of intermediate product formation was analysed in a monomolecular, a homogenous catalytic and in a nucleophilic substitution reactions. Under conditions of the steady-state approximation, the rate of change of the chemical affinity at this stage of reaction must be such that the rate of intermediate formation and that of its decay are nearly identical...

article

Synthesis of 3-chloropropyltrichlorosilane via the catalytic hydrosilylation of allyl chloride with trichlorosilane catalyzed by platinum catalyst - from laboratory scale to pilot plant

J. Guliński, B. Marciniec, H. Maciejewski, S. Oczkowicz

Polish Journal of Chemical Technology > 1999 > Vol. 1, nr 1 > 11-15

The method for the synthesis of 3-chloropropyltrichlorosilane based on the hydrosilylation of allyl chloride with trichlorosilane in the presence of an original Pt catalytic system has been worked out. The yield and selectivity of Cl(CH2)3SiCl3 depend on the nature of the catalytic system and several other factors (the mode of substrate addition, reaction procedure, etc.)- The optimum reaction conditions...

article

Synthesis of polyarylocarbonates from dimethyl carbonate and bisphenol A

J. Wasilewski, B. Tkacz, A. Krueger, B. Krakówka, more

Polish Journal of Chemical Technology > 1999 > Vol. 1, nr 1 > 45-49

Polycarbonates were obtained in the conventional two-stage reaction. In the first stage low molecular weight prepolymer was synthesised and then the prepolymer was condensed to polycarbonate. Transesterification and condensation of the prepolymer was carried out with potassium borohydride as a catalyst. The synthesis of polycarbonate from dimethyl carbonate and bisphenol A with the addition of 0.05-0...

article

Migration of lithium along the fixed bed of Li/MgO and its consequences to the catalytic performance in oxidative coupling of methane

M. Taniewski, A. Lachowicz

Polish Journal of Chemical Technology > 1999 > Vol. 1, nr 1 > 36-39

The migration of lithium along the bed of Li/MgO catalyst in oxidative coupling of methane has been investigated. A scaled-up stainless-steel tubular reactor with a fixed catalyst bed formed from two layers with different Li content was applied. It was discovered by AAS determination that the emission of volatile lithium compounds from the lithium rich working catalyst layer observed during its ageing,...

article

Implant materials

R. Kijkowska

Polish Journal of Chemical Technology > 1999 > Vol. 1, nr 1 > 19-25

Biomaterials for the fabrication of prostheses for medical applications used for the replacement or reparation or augmentation of diseased or damaged body parts are discussed. They are bioinert (e.g. metals, organic polymers, alumina/zirconia ceramics) and bioactive (bioglass, glass-ceramic, hydroxyapatite ceramics). Bioactive biphasic composites or bioactive coatings on the implants provide the combination...

article

Ozone synthesis-mechanism and technology

J. Ozonek, M. Wroński, I. Polio

Polish Journal of Chemical Technology > 2000 > Vol. 2, nr 1 > 19-24

An operational principle of discharge elements applied in ozonizers- chemical plasma reactors for silent discharge generation has been discussed. An analysis of phenomena occurring in ozone synthesis reactors has been presented and on that basis requirements to be met in order to obtain the highest efficiency of an ozone synthesis process have been formulated. The principal quantitative factors that...

article

Development of CYCLOPOL process

S. Ciborowski

Polish Journal of Chemical Technology > 2000 > Vol. 2, nr 1 > 1-4

The development of Polish process CYCLOPOL for cyclohexanone synthesis by cyclohexane oxidation has been described. It has been shown that CYCLOPOL process differs very much from all other cyclohexane oxidation processes exploited in the world industry. Particularly in CYCLOPOL process the sodium hydroxide consumption can be decreased to 5 KGs per one ton of cyclohexanone while in other processes...

article

Crystal growth of L(+)-ascorbic acid in a batch crystallizer

A. Matynia, B. Wierzbowska, E. Szewczyk

Polish Journal of Chemical Technology > 2000 > Vol. 2, nr 1 > 14-18

The measurements of the crystal growth rate in L(+)-ascorbic acid - water and L(+)-ascorbic acid - alcohol - water systems are presented. The influence of methanol, ethanol and isopropanol on the crystallization system has been studied. Measurements were carried out in the batch crystallizer with inner circulation of a suspension. The effect of the saturation temperature and the cooling rate has been...

article

Stability of pyro - and tripolyphosphate complexes with micronutrients and liquid fertilizers

B. Grzmil, B. Kic

Polish Journal of Chemical Technology > 2000 > Vol. 2, nr 1 > 5-9

The conditional stability constants of tripolyphosphate, pyrophosphate and the citrate complexes with respectively Zn2+, Mn2+, Co2+, Cu2+, Fe2+ as a function of pH range (4.5 - 7.5) and the ionic strength of solution (0.1 - 3.0 mol/dm3) have been determined. It was found that the studied complexes at pH values of 6 and 7.5 have higher conditional stability constants than those complexes at pH value...

article

New threats to air pollution control

W. Tylus, J. Zabrzeski, A. Musialik

Polish Journal of Chemical Technology > 2000 > Vol. 2, nr 1 > 38-42

In the past few years, power generation sources mainly contributing to air pollution have been replaced by other, previously less important sources - transport, wood and coal open fire, and municipal waste combustion. The continuing town development, as well as the concomitant rise in the number of cars and fossil fuel or heating oil burning households, has become a dominant contributing source of...

article

Catalytic oxidation of glucose on supported palladium catalysts

S. Karski, T. Paryjczak, J. Rynkowski, I. Witońska

Polish Journal of Chemical Technology > 2000 > Vol. 2, nr 1 > 10-13

The heterogeneous selective liquid phase oxidation of glucose to gluconic acid over palladium supported catalysts was studied. The oxidation reaction was performed in pH range 5 to 11 in a batch reactor using 5 wt-% Pd catalysts supported on active carbon obtained from pits of plums, and on alumina and silica. Inhibition of the catalytic activity and selectivity was observed in an acidic medium. It...

article

Preparation of the mesophase coal tar pitch and its application study

Z. Robak, K. Kubica, A. Mianowski

Polish Journal of Chemical Technology > 2000 > Vol. 2, nr 1 > 25-31

New technology for obtaining mesophase coal tar pitch in the experimental installation of the continuous run system has been developed. The process involves thermal preparation of the coal tar pitch at 400°C in the installation that is a compact system including typical elements of chemical equipment arranged to allow simultaneous run of a few unit operations. Charge of raw materials and discharge...

article

Membrane distillation for environment protection

M. Tomaszewska, M. Gryta, M. W. Morawski

Polish Journal of Chemical Technology > 2000 > Vol. 2, nr 1 > 32-37

Membrane distillation (MD) is still considered as a new promising process of separation of aqueous solutions. The driving force is a difference of partial pressure caused by temperatures and compositions of solutions separated by a microporous membrane. The main features of the process are high selectivity for solutions of non-volatile compounds and the possibility of utilization of waste heat or...

article

Partial oxidation of methane to formaldehyde over a Mo-0/Si02 catalyst

K. Kałucki, M. Michalkiewicz

Polish Journal of Chemical Technology > 2000 > Vol. 2, nr 2 > 17-20

Studies on the oxidation of methane by oxygen over a Mo-O/SiO2 catalyst were performed in a vertical tubular reactor. The process was carried out over a range of temperatures from 400 to 600°C at atmospheric pressure. Both the content of oxygen in the reaction mixture and the contact time were varied. The major products of the oxidation of methane over the Mo-O/SiO, catalyst have been formaldehyde,...

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INFONA - science communication portal

Polish Journal of Chemical Technology

Solubility investigations in the NaVO3 + NH4HCO3 + NH4VO3 + NaHCO3 + H2O system

Promoted nickel steam reforming catalysts: influence of thermal treatment on the activity and resistance to coking

Metal on oxide mondayer - new concept of selective catalyst for a, ß-unsaturated aldehydes hydrogenation

Technology of asbestos-free sealing materials (Gaskets)

The Solid state postpolycondensation of poly(bisphenol a carbonate) in the presence of thermally unstable poly(propylene carbonate)

Alkylation of hydroxyarenes with alcohols in the presence of iron catalyst

Verifying the assumption of a steady-state intermediate concentration

Synthesis of 3-chloropropyltrichlorosilane via the catalytic hydrosilylation of allyl chloride with trichlorosilane catalyzed by platinum catalyst - from laboratory scale to pilot plant

Synthesis of polyarylocarbonates from dimethyl carbonate and bisphenol A

Migration of lithium along the fixed bed of Li/MgO and its consequences to the catalytic performance in oxidative coupling of methane

Implant materials

Ozone synthesis-mechanism and technology

Development of CYCLOPOL process

Crystal growth of L(+)-ascorbic acid in a batch crystallizer

Stability of pyro - and tripolyphosphate complexes with micronutrients and liquid fertilizers

New threats to air pollution control

Catalytic oxidation of glucose on supported palladium catalysts

Preparation of the mesophase coal tar pitch and its application study

Membrane distillation for environment protection

Partial oxidation of methane to formaldehyde over a Mo-0/Si02 catalyst

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