Alkyl polyglycosides (APG) has been paid more and more attention in surfactant industry

not only because APG has high surface activity

but also because it is not hazardous

not irritant

well biodegradable and is made from naturally occurring renewable raw materials

i.e.

starch or glucose. Therefore

APG is called as "surfactant for 21st century"

and technical studies on synthesis and manufactures of APG have been developed rapidly since 1990s

but there is a lack of study on reaction kinetics of APG. The reaction kinetics of synthesis of butyl polyglycosides was studied based on "shrinking core model".A solid-liquid interface reaction model

which contains a step of mass transfer resistance

was proposed. In "shrinking core model"

only the chemical reaction taking place in the solid-liquid reaction system is involved.Under condition of optimal technology parameters for the synthesis of butyl polyglycosides

in which reaction temperature is in the range of 90-110℃

and stirrer rotation speed is from 6.67-13.33r·s -1

mass transfer resistance can not be ignored.The ratio of chemical reaction rate constant to mass transfer coefficient

namely

k r/ k B

obtained by means of solid-liquid interface model

can directly reflect the relative rate of chemical reaction to mass transfer. At the same time

the chemical reaction kinetic parameters were obtained. The results suggest that solid-liquid interface reaction model is more accurate than the "shrinking core model" in describing the formation of butyl polyglycosides which is the first step of synthesis of APG.