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These examples illustrate the effect of feed water content, temperature, pressure, and catalyst level on the hydrocar› boxylation of formaldehyde (trioxane) with triflic acid as catalyst, with n-butyric acid and glycolic acid as solvent/ reactant. 

Example 97 was repeated with only one feed at 0.91 g/min. The feed contained 14.6 wt% paraformaldehyde, 6.2% water, 28.8 wt% butyric acid, 48.2 wt% glycolic acid, and 2.2 wt% triflic acid. The feed molar ratio was paraformaldehyde (1.0), water (0.7), glycolic acid (1.5), and triflic acid (0.03). The hold-up time was 95 minutes. The feed rate of carbon mon› oxide was 498 SCCM. The operating pressure and tempera- ture, along with conversion, space-time yield, and selectivity of reacted formaldehyde to end products are summarized in Table 18. 

## Examples 144-147 

