soapless detergent

piyopiyo

02年的一題...
NaOH 點樣be used in manufacture of soapless detergent

[ 本帖最後由 piyopiyo 於 23-4-2008 20:06 編輯 ]

Puppet

soapless detergent多數係sodium salt of -SO3H / -O-SO3H

jackiema

八卦問問:
manufacture of soapless detergent 係唔係 out of syllabus?

包包 klau1001

原帖由 jackiema 於 23-4-2008 22:09 發表
八卦問問:
manufacture of soapless detergent 係唔係 out of syllabus?

印象中係Out左...
soap 就in

piyopiyo

即是我做呢題都是 out syl?[[tk_33]]

Puppet

No, it isn't.
One needs to know soapless detergents are made from petroleum fractions, conc. sulphuric acid and sodium hydroxide. Only equations are not required.

jacky2580

NaOH 係 catalyst  定係reactant？

jackiema

原帖由 jacky2580 於 24-4-2008 21:58 發表
NaOH 係 catalyst  定係reactant？

reactant 掛...
detergent 佢有個 Na+ / K+ cation 架喎

包包 klau1001

原帖由 jackiema 於 24-4-2008 22:15 發表

reactant 掛...
detergent 佢有個 Na+ / K+ cation 架喎

有一年PP話佢係catalyst...

學校呀sir話因為the reactants reacts better in alkaline medium...
所以OH- 是catalyst
而Na+ 就係reactant..
佢話呢條q出得唔好...

[ 本帖最後由 包包 klau1001 於 25-4-2008 07:21 編輯 ]

Puppet

原帖由 包包 klau1001 於 25-4-2008 07:17 發表

有一年PP話佢係catalyst...

學校呀sir話因為the reactants reacts better in alkaline medium...
所以OH- 是catalyst
而Na+ 就係reactant..
佢話呢條q出得唔好...

果條講的是soapy detergents
做soapless detergents加NaOH唔係cat.

在soapy同soapless detergents的製造裡,
Na+都只係spectator ions
OH-實係reactant, OH- + R-COOH ---> H2O + R-COO(-)
Controversial的只是在saponification內NaOH是否cat.