Aluminium polychlorosulphates, process for their preparation and use thereof
OwnerBernardo Pozzoliinventor
Life of this patent
Estimating the term…
Abstract
Aluminum polychlorosulphates having the general formula (I) Al(OH)l Clm(SO4)nMp(I) where M represents an alkali metal l, m, n, p represent the number of moles per mole of aluminum, so that 1.74≦l≦2.25, 0.01≦n≦0.17, 0.32≦p≦1.49, and l+m+2n=p+3, their use as coagulation and flocculation agents, and their preparation process by reaction, at room temperature, of an alkali metal basic compound, such as Na2CO3, NaHCO3, NaOH, K2CO3, KHCO3 and KOH, and an alkali metal sulphate or sulphuric acid with an aluminum polychloride or polychlorosulphate having the general formula(I′) Al(OH)l′Clm′(SO4)n′Mp′(I′) where 1.1≦1′≦1.44, n′≦0.10, p′<p(p of formula (I)), and l′+m′+2n′=p′+3.
Claims9
Aluminum polychlorosulphates having the general formula (I)
- Al(OH)lClm(SO4)nMp (I)
- where
- M represents an alkali metal,
- l, m, n, p represent the number of moles per mole of aluminum, so that:
- 1.74≦l≦2.25,
- 0.065≦n≦0.17,
- 0.32≦p≦1.49, and
- l+m+2n=p+3,
- and whose basicity, defined as (l/3)×100, ranges between 58% and 75%.
A process for the production of the aluminum polychlorosulphates having the general formula (I)
- Al(OH)lClm(SO4)nMp (I)
- where
- M represents an alkali metal,
- l, m, n, p represent the number of moles per mole of aluminum, so that:
- 1.74≦l≦2.25,
- 0.065≦n≦0.17,
- 0.32≦p≦1.49, and
- l+m+2n=p+3,
- and whose basicity, defined as (l/3)×100, ranges between 58% and 75%, comprising the following steps, carried out at room temperature:
- (a) reaction of a basic compound of an alkali metal with aluminum polychloride or polychlorosulphate having the general formula (I′)
- Al(OH)l′Clm′(SO4)n′Mp′ (I′)
- where
- 1.1≦l′≦1.44,
- 0≦n′≦0.10,
- p′≦p (p of formula (I)),
- l′+m′+2n′=p′+3;
- (b) reaction of the product obtained from step (a) with an alkali metal sulphate.
Dependencies are inferred from the claim text.