Clean process for preparing a chloroformyl-substituted benzene by oxidation of a tail gas hydrogen chloride from a chlorination reaction and a chloroacylation reaction and recycling of the resulting oxidation product chlorine gas into the chlorination reaction. The present invention provides a clean process for preparing a polymer-grade chloroformyl-substituted benzene.

Provided is a wood preservation treatment liquid including: an organic solvent containing 1-chloro-2,3,3,3-tetrafluoropropene; and a wood preservative.

Provided is a wood preservation treatment liquid including: an organic solvent containing 1-chloro-2,3,3,3-tetrafluoropropene; and a wood preservative.

A resist composition which generates an acid upon exposure and whose solubility in a developing solution is changed due to an action of the acid, the resist composition including a base material component whose solubility in a developing solution is changed due to the action of an acid; and a compound represented by Formula (d1) in which R.sup.b1 and R.sup.b2 each independently represents COO.sup., COOH, or a hydroxyl group, where at least one of R.sup.b1 and R.sup.b2 represents COO.sup., R.sup.b3, R.sup.b4, and R.sup.b5 each independently represents a hydroxyl group or a halogen atom, R.sup.b6 to R.sup.b8 each independently represents an alkyl group, nb3 represents an integer of 0 to 4, nb4 and nb5 each independently represents an integer of 0 to 2, nb6 to nb8 each independently represents an integer of 0 to 5, m represents 1 or 2, and q represents an integer of 0 to 3.)

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Clean process for preparing a chloroformyl-substituted benzene by oxidation of a tail gas hydrogen chloride from a chlorination reaction and a chloroacylation reaction and recycling of the resulting oxidation product chlorine gas into the chlorination reaction. The present invention provides a clean process for preparing a polymer-grade chloroformyl-substituted benzene.