sulfide is a colorless gas with an obnoxious rotten egg odour. H2S is highly flammable, noxious and vitriolic in nature. Many petroleum and natural gas processing industries produces H2S as a by-product gaseous stream. Most H2S in the air comes from natural sulfur cycle. Exposure to H2S can lead to various health issues like burning/tearing of eyes, cough, and shortness of breath. Moderate concentration can lead to respiratory issues. So it is advisable to make use of this gas in other industrial operations
Industries use two methods because it is the most common as well as the most reliable way to recover sulfur from the earth. There are many ways to extract sulfur but the two most common ways are the Frasch process and the extraction through natural gas. 2.1. Overview of Sulfur Sulfur is the 16th chemical element present on the periodic table of elements. Although the element is colorless, it appears as a yellow colored crystal shaped solid at room temperature. Sulfur is widely used around the
Introduction: One equivalent of an aromatic aldehyde, two equivalent of an ethyl acetoacetate, and one equivalent of ammonia on refluxing in an alcohol to give Hantzsch ester. The first step, the condensation of acetoacetate with the aryl aldehyde,known as the Knoevenagel reaction. In the second step, the other half of the molecule can be assembled from ammonia and the second equivalent of acetoacetate; the product is an enamine, which is known as Stork enamine reaction. The third step is conjugate
Chapter-2 Efficient ZnO NPs catalyzed Friedlander annulations in the synthesis of diverse quinolin-2(1H)-ones 2.1.1 INTRODUCTION OF QUINOLINONES AND QUINOLINES The quinolinone and quinoline ring is highly prevalent in natural compounds. There are synthetic and potential agents, which show various pharmacological properties (Priya et al., 2012). Quinolinones are important structural intermediates for synthesis of functionalized quinolines (Baston et al., 2000). Quinolines have demonstrated various