A process for preparing trioxane from methanol includes: step 1: subjecting a mixture of methanol and methylal to a reaction to obtain formaldehyde, and absorbing the formaldehyde with water to obtain a concentrated formaldehyde aqueous solution; step 2: subjecting the concentrated formaldehyde aqueous solution to cyclization to obtain a mixture containing trioxane, and passing the mixture through a trioxane concentration tower to obtain a crude trioxane product; step 3: converting a by-product and unreacted formaldehyde in the crude trioxane product into methanol, conducting dehydration through a membrane dehydration process, and subjecting a retentate to dealcoholization to obtain purified trioxane; and step 4: subjecting the remaining streams to reactive distillation to obtain a mixture of methanol and methylal at a top-and water at a bottom of the reactive distillation tower; returning the mixture of methanol and methylal to step 1; and returning or discharging the water.

A process for preparing trioxane from methanol includes: step 1: subjecting a mixture of methanol and methylal to a reaction to obtain formaldehyde, and absorbing the formaldehyde with water to obtain a concentrated formaldehyde aqueous solution; step 2: subjecting the concentrated formaldehyde aqueous solution to cyclization to obtain a mixture containing trioxane, and passing the mixture through a trioxane concentration tower to obtain a crude trioxane product; step 3: converting a by-product and unreacted formaldehyde in the crude trioxane product into methanol, conducting dehydration through a membrane dehydration process, and subjecting a retentate to dealcoholization to obtain purified trioxane; and step 4: subjecting the remaining streams to reactive distillation to obtain a mixture of methanol and methylal at a top-and water at a bottom of the reactive distillation tower; returning the mixture of methanol and methylal to step 1; and returning or discharging the water.

The present disclosure is directed to a process for producing a polyoxymethylene polymer or paraformaldehyde in an environmentally friendly and sustainable manner. The polyoxymethylene polymer or paraformaldehyde can be produced so as to be carbon neutral or even carbon negative. In one aspect, the polyoxymethylene polymer or paraformaldehyde is formed from a biogas or from a recycled gas. The biogas and the recycled gas are used to produce the components needed to form the polymer.

The present disclosure is directed to a process for producing a polyoxymethylene polymer or paraformaldehyde in an environmentally friendly and sustainable manner. The polyoxymethylene polymer or paraformaldehyde can be produced so as to be carbon neutral or even carbon negative. In one aspect, the polyoxymethylene polymer or paraformaldehyde is formed from a biogas or from a recycled gas. The biogas and the recycled gas are used to produce the components needed to form the polymer.

The present invention concerns a method for preparing 1,3,5-trioxane by trimerization of formaldehyde in the presence of methanesulfonic acid. The invention also concerns the use of at least one catalyst comprising methanesulfonic acid for the trimerization of formaldehyde into 1,3,5-trioxane.

The present invention concerns a method for preparing 1,3,5-trioxane by trimerization of formaldehyde in the presence of methanesulfonic acid. The invention also concerns the use of at least one catalyst comprising methanesulfonic acid for the trimerization of formaldehyde into 1,3,5-trioxane.

The present invention relates to compositions comprising 1,2,4-trioxane compounds and chlorogenic acids. The invention further provides a method for the stabilization of 1,2,4-trioxane compounds against degradation, in particular against thermal degradation or degradation induced by reducing agents such as reducing carbohydrates, reducing sugars, electromagnetic radiation or heavy metal ions.

The present invention relates to a process for energy recovery in a process for the preparation of 1,3,5-trioxane.

The present invention relates to a process for energy recovery in a process for the preparation of 1,3,5-trioxane.

The present invention relates to antiviral 1,2,4-trioxane compounds and compositions comprising the same that are effective inhibitors of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) replication, and are thus useful to treat the coronavirus disease 2019 (COVID-19). The invention further provides pharmaceutical compositions containing such antiviral compounds and antiviral compositions, and methods of using these antiviral compounds, antiviral compositions and pharmaceutical compositions in the treatment and prevention of COVID-19.