Alexandr I Valdman

Title: Alexandr I. Valdman and His Acrolein Production Patent.

Introduction

Alexandr I. Valdman is an inventor associated with Volzhsky, Russia. His recorded patent work includes 1 patent, focused on producing acrolein through a process designed to improve production continuity and product purity.

Latest Patents

Valdman’s listed patent, “Method of Producing Acrolein,” describes a process that evaporates acetaldehyde and formaldehyde in the presence of diphenyl-N-nitrosamine. The aldehyde vapors undergo gas-phase aldol condensation over coarsely porous silica gel promoted with sodium silicate, at temperatures between 270°C and 300°C.

The resulting gas mixture is cooled, and the condensate is separated through rectification. The process recovers an aqueous formaldehyde solution for concentration and reuse, while a mixture containing acrolein, acetaldehyde, and water undergoes further rectification to isolate the acrolein product. Acetaldehyde containing a small amount of acrolein is returned to the evaporation stage.

The patent states that the method prevents resinification during aldehyde evaporation, enables continuous removal of resins formed during condensation, and supports continuous rectification. It also reports an acrolein content of 91 to 93 percent in the distillate.

Career Highlights

The available information identifies Valdman’s work through this chemical-process invention. The patent’s central contribution is an integrated production and recovery method that recycles process materials while addressing resin formation and acrolein purity.

Collaborations

Valdman’s listed coworkers include Vyacheslav K. Rykov and Stanislav V. Sukhanov. The available information does not specify their individual roles in the patent.

Conclusion

Alexandr I. Valdman’s acrolein production patent presents a continuous process that combines gas-phase condensation, product separation, and material recycling to reduce resinification and improve product purity.