from about 5 to about 50 weight percent koh after the neutralization is complete formulations are directly prepared by addition of the appropriate amounts of propylene glycol and water to the reaction mixture in practice it is often more convenient to transfer the neutralized reaction mixture into a larger vessel already containing the calculated amounts of propylene glycol and water prior to the preparation of the formulation the neutralized reaction mixture may be analyzed by conventional techniques such as for example liquid chromatography in order to determine the precise amount of the active ingredient present and to calculate the amounts of propylene glycol and water necessary for producing the desired formulation because of the nearly quantitative reaction yields however the amounts of propylene glycol and water to be added can conveniently be calculated on the basis of the raw materials charged propylene glycol has been found to be uniquely suited to stabilize formulations prepared directly from the neutralized reaction mixture such formulations remain free of phase separation and precipitation despite undergoing freeze thaw transitions by practicing the process of this invention formulations comprising the following compositions can be prepared ______________________________________ weight percent______________________________________2 alkylthio ethanamine hydrohalide 1 40propylene glycol 1 50water 30 95propionic acid 0 25 10potassium propionate 0 10______________________________________ ______________________________________ weight percent______________________________________2 alkylthio ethanamine hydrohalide 5 35propylene glycol 5 35water 40 65propionic acid 1 8potassium propionate 0 3______________________________________ optionally surfactants or antifoam agents can be added to the formulations.