Chemical Process
Nylon 6-6 is manufactured from

Dimethyl terephthalate and ethylene glycol
Caprolactum
Hexamethylene diamine and maleic anhydride
Hexamethylene diamine and adipic acid

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Chemical Process
In multistage equilibrium conversion of SO₂ to SO₃ (2SO₂ + O₂ ⇋ 2SO₃), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO₂ to SO₃ can be increased by

Maintaining low temperature & pressure in the converter
Removing some quantity of SO₃ during intermediate stage
Increasing the oxygen concentration
Putting more quantity of V₂O₅ catalyst in the converter

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