Quimica

patent and nonpatent literature with 130 references.** KEY WORDS: melamine, review, mode of action, formulation. as an additive flame retardant has a long Its best known applications in flame-retardant coatings [1,2] history. (usually with a charrable polyol and a phosphate charring catalyst) THE USE OF melamine *Author to whom correspondence should be addressed. **Please note that small scale test results as reported herein do not reliably predict full scale fire behavior. Also note that the present authors do not advocate, nor warrant the performance, of any of the formulations discussed herein. 104 JOURNAL OF FIRE SCIENCES, VOL. 13-MARCH/APRIL 1995 0734-9041/95/02 0104-23 $10.00/0 @ 1995 Technomic Publishing Co., Inc. Downloaded from http://jfs.sagepub.com by naian liu on February 8, 2007 © 1995 SAGE Publications. All rights reserved. Not for commercial use or unauthorized distribution. 105 foams [3-5,5a-g] (usually with haloalkyl phoshave been reviewed elsewhere, and the reader is referred to the phates) cited references. However, the utility of melamine in thermoplastics and thermoset resins has perhaps not been as widely recognized, and thus the present review will deal with these non-coating, non-urethanefoam applications. and in polyurethane GENERAL OBSERVATIONS ON MODES OF ACTION An examination of the mode of action of melamine also illustrates a typical problem of flame retardant mechanisms. There are a multitude…

of ZnO are examined over the temperature range 400-1600 K. Above 1340 K, the equilibrium composition of the stoichiometric chemical system consists of an equimolar gas mixture of Zn (vapor) and CO. Assuming a firstorder rate constant for the surface reaction kinetics between ZnO(s) and CO and further applying a shrinking spherical particle model with an unreacted core, the apparent activation energy obtained by linear regression of the thermogravimetric data is EA ) 201.5 kJ/mol. A…

Fullerton, Fullerton, CA 92634 S T he American Chemical Societv has established puidelines for undergraduate educatio; calling for an increased emohasis o n inorganic and descriptive chemistry. One possible'way of implementing t hese changes in our &rricula is to reorganize the general chemistry sequence. By necessity, this approach will also require a revision o f t he introductory laboratory. Typically, laboratory experiments in general chemistrv emohasize nhvsical and…

DeHoff) Prof. Dr. José Pedro Donoso Capítulo 7 7.1 – Structure of unary phase diagrams in (P,T) space Chemical Potentials and Gibbs free energy. Calculation of Chemical Potential surfaces 7.2 – The Clausius – Clapeyron equation dP ∆S α → β = dT ∆V α → β dP ∆H α → β = dT T∆V α → β 7.3 – Integration of the Clausius – Clapeyron equation Vaporization and sublimation curves. Phase boundaries between condensed phases 7.4 – Triple points. Example 7.1: Phase diagram…

2nd Mercosur Congress on Chemical Engineering 4th Mercosur Congress on Process Systems Engineering PRESSURE SWING ADSORPTION FOR CARBON DIOXIDE SEQUESTRATION Carlos A. Grande *, Simone Cavenati, Alírio E. Rodrigues Laboratory of Separation and Reaction Engineering (LSRE), Departamento de Engenharia Química, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias (4200-465), Porto, Portugal. Abstract. The members of the MERCOSUR as well as the European Union have…

Sharif University of Technology, P.O. Box 11155-3516, Tehran, Iran a r t i c l e i n f o a b s t r a c t Essential oils (EOs) are valuable natural products that are popular nowadays in the world due to their effects on the health conditions of human beings and their role in preventing and curing diseases. In addition, EOs have a broad range of applications in foods, perfumes, cosmetics and human nutrition. Among different techniques for analysis of EOs, gas chromatography–mass…

The New Name in Vinyl Additives A New Leader Galata Chemicals, more than just a change in name Galata Chemicals is a global marketer of specialty chemicals and products that service the PVC and associated industries. Building on the company’s valuable intellectual property and over 40 years operating experience, Galata Chemicals has the people, the products and the ‘know how’ to create optimized solutions that will add value to their customers’ products and help them grow. The…

DIVULGAÇÃO SUBSTÂNCIAS ENANTIOMERICAMENTE PURAS (SEP): A QUESTÃO DOS FÁRMACOS QUIRAIS Eliezer J. Barreiro Departamento de Fármacos - Faculdade de Farmácia - Universidade Federal do Rio de Janeiro - Cidade Universitária - CP 68006 - 21944-910 - Rio de Janeiro - RJ Vitor. F. Ferreira Departamento de Química Orgânica - Instituto de Química - Universidade Federal Fluminense - Campus do Valonguinho - 24020150 - Niterói - RJ Paulo R. R. Costa Núcleo de Pesquisas de Produtos Naturais - Centro…

de adsorção é a que corresponde à monocamada. - A adsorção é localizada e ocorre por colisão de moléculas com sítios vazios. A expressão pode ser utilizada para isoterma do Langmuir. X N m KC = W 1 + KC (1) onde X é o número de moles do soluto adsorvido por W gramas de adsorventes em equilíbrio com o soluto de concentração C. A constante Nm é o valor de saturação da monocamada em moles por grama e não depende da temperatura na ausência de interferência do solvente. A…

n-butilo representa-se no esquema 2. Nesta reação forma-se o acetato de n-butilo (produto) e água (co-produto). Síntese do acetato de n-butilo Parte I: Pág. 2/4 Esquema 2. Equação química da síntese do acetato de n-butilo. A esterificação, ativada pela autoprotólise de um ácido carboxílico, ocorre sem a presença de catalisadores de forma extremamente lenta. A velocidade da reação aumenta quando se usam catalisadores ácidos.7,8 Os catalisadores ácidos são corrosivos e têm…