Full Modvat credit on sulphuric acid used in manufacture remains admissible despite spent acid or residue, under settled precedent.

Modvat credit on sulphuric acid used in manufacture was held admissible on the full quantity consumed in the process, even where part of the acid emerged as spent acid, waste or residue. The analysis noted that the dispute was not driven by any live classification issue and that earlier Tribunal precedent, together with a binding section 37B circular, had already settled credit admissibility on the entire input quantity. On that basis, the departmental challenge could not displace the finding allowing credit, and the order granting full credit was upheld.

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Issues: Whether the respondent was entitled to full Modvat credit on sulphuric acid used in the manufacture of nitrobenzene and para toluene sulphuric acid, notwithstanding that part of the acid emerged as spent acid/by-product, and whether the department's challenge based on classification of the spent acid could sustain the appeal.

Analysis: The demand notices and the order-in-original were concerned with recovery of Modvat credit and did not turn on any live classification dispute. The order under appeal proceeded on the basis of the Tribunal's earlier decision and the Board's circular issued under section 37B, both of which had settled that credit was admissible on the full quantity of sulphuric acid used in the process, even if part of it was converted into spent acid, waste, or residue. Since the controversy raised in the appeal was confined to classification, and that issue was not the basis of the impugned demand, the departmental challenge could not displace the finding allowing credit.

Conclusion: The respondent was entitled to full Modvat credit on the sulphuric acid used in the manufacturing process, and the department's appeal failed.

Final Conclusion: The order allowing credit was upheld and the department's appeal was rejected.

Ratio Decidendi: Where the relevant issue is admissibility of Modvat credit on inputs used in manufacture, credit cannot be denied merely because a part of the input emerges as spent acid, by-product, waste, or residue, especially when the issue has already been settled by a binding departmental circular and precedent.

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