Chemical Iran Blogs

Sodium sulfide production methods: Sodium sulfide (Na2S) is a yellow to red solid material soluble in water, slightly soluble in alcohol. It is a strong reducing agent and reacts with oxidant. No commercial process for the production of sodium sulfide containing neither water nor iron is known. The commercially available sodium sulfide is in every case produced by reduction of sodium sulfate, usually by means of carbon, but also by means of hydrogen and other reducing gases. Reduction with carbon yields a crude melt, which contains, in addition to sodium sulfide, considerable amounts of impurities and by-products such as unreacted carbon, ash constituents, impurities from the carbon, carbonates, sulphites, sodium thiosulfates, and iron compounds. This crude melt is usually extracted with water so that the water-soluble part of the impurities and considerable amounts of iron pass into the extraction liquor. Other reactions take place subsequently in the aqueous solution, and these lead to undesirable by-products. by evaporating the extraction liquor, either crystals of the composition Na S.9H O are obtained or with further evaporation, a product containing 60% of Na S solidifies from the melt. Both hydrates, namely the hydrate crystallising from the solution and containing 32% of Na S, contain considerable amounts of soda, sulfite, thiosulfate, sulfate, and iron salts. The commercially available substance containing 60% Na is colored a dark reddish brown by the iron and can scarcely be used for certain purposes such treatment of textiles. It is not technically or economically possible to reduce the residual 40% of water content by further evaporation on account of the extraordinarily steep rise in the melt temperature above 60% of Na-S and since a suitable material for use in making the necessary apparatus which is resistant to concentrated sodium sulphite melt is unknown. Even evaporation to only 60% of Na S necessitates the use of apparafus made from expensive special alloys or causes heavy wear on other materials. A process has now been discovered for obtaining a sodium sulphide of excellent purity by reduction of sodium sulphate with carbon or other reducing agents, which sulphide is in particular free from iron and water. The process is based on the fact that anhydrous sodium sulphide, unlike the hydrate, dissolves readily in alcohols. Claim1: In a process for the production of pure anhydrous sodium sulfide free from iron, the step which comprises heating the melt obtained by reduction of sodium sulfate with carbon and which contains impurities resulting from the reduction process, with an alcohol, filtering the sodium sulfide solution thereby formed and recovering the sodium sulfide from the said solution by evaporating the alcohol. It is known that sodium hydroxide may be reacted with H2S to form Na2S which may be treated with more H2S to convert Na2S to NaHS, and it has been proposed to make sodium hydrosulfide by gassing an Na2S-NaHS liquor with pure hydrogen sulfide. In processes of the type to which the invention relates, the source of sodium is commercial caustic soda which contains appreciable quantities of impurities, such as iron, copper, nickel, manganese and silicon. These impurities do not discolor caustic soda to any great extent, and hence their presence in commercial caustic is unobjectionable. However, during H2S gassing of commercial caustic liquor, such impurities pass thru the process and are carried into the resulting NaHS liquor. Such impurities may be present in the NaHS liquor as soluble salts or suspended in finely divided condition. While probably largely sulfides, exact compositions of the impurities are not known, and whatever their nature, these subtances are referred to herein as metallic impurities. The presence of even small amounts of these impurities in Na2S or NaHS solutions results in products of very poor appearance because of the highly colored nature of the impurities after having been subjected to H2S gassing. Accordingly, a major problem presented in manufacture of relatively pure sodium hydrosulfide has been the elimination of such impurities. Commercially available hydrogen sulfide gases contain appreciable amounts of carbon dioxide as an impurity. Claim2: the method for producing purified sodium sulfide from a sodium hydrosulfide liquor containing (a) at least one metallic impurity of the group consisting of iron, copper, nickel, manganese, and silicon, and (b) an amount of available carbonate of sodium equivalent to more than 0.06% by weight of CO3 radical, which method comprises treating said liquor with an alkaline earth compound so as to react with available carbonate of sodium to precipitate combined CO3 thereof as alkaline earth carbonate, the amount of said alkaline earth compound being at least sufficient to reduce the available carbonate of sodium content of said liquor to an amount equivalent to not more than 0.06% by weight of CO3 radical, controlling the composition of the resulting liquor so that such liquor contains not more than 5% by weight of sodium sulfide, thereby effecting coagulation and precipitation of metallic impurities, and separating said metallic impurities from such liquor. Claim3: The method for producing purified sodium sulfide from a sodium hydrosulfide liquor containing (a) metallic impurities of the type present in commercial sodium hydroxide, and (b) an amount of available carbonate of sodium equivalent to more than 0.06% by weight of COA radical, which method comprises treating said liquor with an alkaline earth compound so as to react with available carbonate of sodium to precipitate combined Cos thereof as alkaline earth carbonate, the amount of said alkaline earth compound being at least sufficient to reduce the available carbonate of sodium content of said liquor to an amount equivalent to not more than 0.06% by weight of Cos radical, controlling the composition of the resulting liquor so that such liquor contains not more than 5% by weight of sodium sulfide, thereby, effecting coagulation and precipitation of metallic impurities, and separating said metallic impurities from such liquor. Sodium sulfide applications: Sodium sulfide is one of the main chemicals and raw materials in so many industries such as mining industry, leather industry, metallurgy industry, textile industry, dyes and intermediates, pulp and paper, soda ash manufacturing, metal refining industry. Sources: http://www.freepatentsonline.com https://patents.google.com

With respect to be located in one of the most strategic regions in the world, having good access to major commercial ports, railway stations and land roads in the world, high quality of the manufactured chemical raw materials and petrochemical products, and competitive prices which can beat so many other manufacturers in the world, there are thousands of big and medium importers around the world especially in India, East Africa, South Asia, Europe and South America which are willing to buy chemicals and petrochemical products from Iran. But, they have worries that how can they purchase from Iran in a smooth way? And how can they receive their purchased products in a safe way? The fact is that all the companies in the field of leather, textile, mining industries, metallurgy, agriculture, fertilizer manufacturing, chemical manufacturing, refinery, oil and gas, food production, metal refining, alumina refining, lubricant manufacturing, detergent manufacturing, cosmetics manufacturing, construction, water treatment, candle and match manufacturing, paint and dyes manufacturing can benefit from high quality Iran origin chemical raw materials with competitive prices, but how? The first barrier for the customers is banking transactions: Almost all the major banks in the world refuse to do transactions with Iranian banks due to U.S. sanctions. Besides, almost none of Iranian manufacturers have any offshore company or bank account. So, as almost all Iranian chemicals manufacturers sell their products on EXW basis with the payment term of 100% cash in advance, it is impossible to buy from Iran on L/C, D/P, or any other credit basis. How can Chemical Iran solve banking issues? With accurate and exact study of the political and economical situation in the region, we decided to establish our strong partner company in Dubai. We arrange all our banking transactions and shipping documentation through our partner company outside Iran. Therefore, we are pleased to inform you that we can receive payments in EUR/USD/AED in our Dubai partner company without any limitation. We export two types of products; A- our own manufactured products B- the products we supply from governmental factories. With all governmental and private chemical and petrochemical complexes of Iran that we supply from, we set local contract through our local company national ID, with all the required terms and conditions of our local regulations. The arbitration of the contract will be Iran Judiciary Organization. First of all, it has been almost a decade, we have been manufacturing, trading and exporting chemicals from Iran. So, not only we have deep knowledge of each factory one by one, but also we have strong business relationship with all our Iranian giant and top manufacturers. So, fortunately, with proven track record of export of tens of thousands of chemicals to 3 continents of the world, we have never had any unsolvable experiences with any of our partner manufacturers. By the way, if any corruption or breach of contract happens by the manufacturer, we can easily make complaint and close their factory through our professional lawyers until they fulfill their commitments due on the contract. Therefore, our customers can be 100% assured that their payments will be totally safe with us. All of our customers can experience a smooth business with Iran through our company as their loyal partner. The second barrier is shipping cargoes out of Iran: Firstly, almost all major shipping lines have stopped their services after re-imposed invaded U.S. sanctions of Iranian ports. Secondly, almost all Iranian chemical and petrochemical manufacturers and refineries sell their products on EXW factory basis in bulk, and it is very difficult for foreign customers to make their shipments out of Iran as it is almost impossible for them to communicate with local transportation and packaging/drumming companies in Iran. How can Chemical Iran ship chemicals out of Iran? Depending on the port of destination, all our sea shipments will be transhipment or cross-stuffed via Jebel Ali Port of UAE or ports of Turkey. So, we are pleased to inform you that we can deliver all your orders in any region in the world by vessel, train or truck through the fastest smoothest and most cost-effective routes.   Shipping documents including commercial invoice, packing list, certificate of analysis, and certificate of origin will be issued on our beneficiary Dubai company letterhead. We also have the ability to design and print customized packaging for our strong customers upon solo partnership contracts. Chemical Iran manufactures, supplies and exports so many strategic chemicals and petrochemical products such as Caustic Soda Flakes 98-99%, Caustic Soda Lye 48-50%, Sodium Sulfide Yellow Flakes 60±2%, Mono ethylene glycol (MEG), Paraffin wax (1-3%)(3-5%)(5-7%), and Mono ethanol amine. It would be our honor to inform you that we can be your loyal chemical partner in Iran in order to fulfill all your chemicals and raw materials requirements, so that a dream of smooth business with Iran can come true for your esteemed company. In order to get any further information about our products, please do not hesitate to send us an email: sales@chemicaliran.com