Polyvinylpolypyrrolidone Supported Brønsted Acidic Catalyst for Esterification

Table 2

Esterification of n-butanol and acetic acid under different condition. CH₃COOH + CH₃(CH₂)₃OH CH₃COO(CH₂)₃CH₃ + H₂O.

Entry	Catal.	Conv.	Sel.
1	–	20.3	100
2	H2SO4	85.1	87.1
3	PVPP-H2SO4	89.3	88.5
4	H3PW12O40	96.9	95.8
5	[BSPy]HSO4	96.1	100
6	[PVPP-BS]HSO4	99.6	100

n-Butanol (7.12 g); acetic acid (4.80 g); and [PVPP-BS]HSO₄ (8 wt%), 90°C for 3 h. H₂SO₄, H₃PW₁₂O₄₀, PVPP-H₂SO₄, and [BSPy]HSO₄ were used in a similar proton content as [PVPP-BS]HSO₄.
Conversion of acetic acid.
Selectivity for ester.